Conferences

• 9th International Arab Conference on Mathematics and Computations (IACMC 2025), Zarqa University, Zarqa, Jordan, May 7-9, 2025 (plenary speaker)

• The Fourth International Conference on Mathematics and Statistics, American University of Sharjah, Sharjah, UAE, February 20-22, 2025 (plenary speaker)

• ICMC Summer Meeting on Differential Equations, Sao Carlos, Brazil, February 3-5, 2025

• ICMAACS 2024, Shanghai, China, December 6-8, 2024 (member of Scientific Committee)

• ATA2024, Analysis, Topology, and Applications, Vrnjacka Banja, Serbia, June 29 - July 3, 2024 (member of Scientific Committee) Cacak

• ICDEA2024, Twentyninth International Conference on Difference Equations and Applications, Paris, France, June 24-28, 2024 (plenary speaker)

• APPLMATH2024, Messina, Italy, June 17-18, 2024 (invited speaker) News

• ICMASTS-2024, Assam Don Bosco University, Assam, India, May 7-8, 2024 (invited speaker) Flyer

• Dynamical System Modeling and Stability Investigation, DSMSI-2023, Kyiv, Ukraine, December 5-7, 2023 (member of International Program Committee)

• TYAN-Humboldt Workshop in Mathematics, Universidade de Brasilia, Brasilia, Brazil, October 2-6, 2023 (plenary speaker) Pic

• ISIM & ISWIM 2023, Analysis, Approximation, Applications, Bucharest, Romania, June 28-30, 2023 (keynote speaker) Certificate

• AAA2023, Analysis, Approximation, Applications, Vrnjacka Banja, Serbia, June 21-24, 2023 (invited lecturer)

• NUMTA2023, Numerical Computations: Theory and Algorithms, TUI Magic Life Calabria, Italy, June 14-20, 2023 (invited speaker) Pic

• ICMA23, International Conference on Mathematics and its Applications, Future University, Cairo, Egypt, March 14-16, 2023 (invited speaker) Certificate

• Editor Insights: Publishing in Mathematical Sciences, Webinar, Taylor & Francis, March 14, 2023 (panelist) Pic

• ICNAA-2022, Assam Don Bosco University, Assam, India, November 22-23, 2022 (invited speaker) Flyer Program

• ICAMCS-2022, DIT University, India, October 12-14, 2022 (member of International Advisory Committee) Program

• Dynamical Systems, Modeling, and Mathematical Sciences, Dubai, UAE, September 23-25, 2022 (member of Scientific Committee, plenary speaker)

• ICMME2022, International Conference on Mathematics and Mathematics Education, Denizli, Turkey, September 22-24, 2022 (member of Scientific Committee)

• Equadiff 15, Brno, Czech Republic, July 11-15, 2022 (member of Scientific Committee)

• ICMA²SC'20, Porto, Portugal, June 21-25, 2020 (plenary speaker) New Dates: June 27-29, 2022 Pic

• ICPAM-VAN 2022, Van, Turkey, June 22-23, 2022 (plenary speaker)

• Dynamic Equations on Time Scales, Bedlewo, Poland, May 25-29, 2022 (member of Scientific Committee) Pic Program

• ICRDET-2022, 3rd International Conference on Recent Development in Engineering & Technology, Anand International College of Engineering, Kanota, Jaipur, Rajasthan, India, February 25-26, 2022 (keynote speaker) Pic Pic

• ICFAS2021, Antalya, Turkey, October 19-21, 2021 (member of Scientific Committee)

• International Symposium on Recent Advances in Mathematics & Applications, Assam Don Bosco University, Guwahati, India, September 28, 2021 (plenary speaker) Flyer YouTube

• Dynamic Equations on Time Scales, Bedlewo, Poland, May 19-23, 2021 New Dates: August 25-29, 2021 Pic Pic Program

• ICMMAAC-21, JECRC University, Jaipur, India, August 5-7, 2021 (member of International Advisory Board)

• World Congress of Global Optimization, Athens, Greece, July 7-10, 2021 (Program)

• 5th Brazil-China Symposium on Applied and Computational Mathematics, Dongguan University of Technology, Dongguan, China, March 20-22, 2021 New Dates: August 23-24, 2021 (Program / Certificate)

• XIII Summer Workshop in Mathematics, UNB, Brasilia, Brazil, February 8-12, 2021 (Program)

• International Conference on Applied Nonlinear Analysis and Soft Computing, Gauhati University, India, December 22-23, 2020 (Program)

• ICMMAAC-20, JECRC University, Jaipur, India, August 7-9, 2020 (member of International Advisory Board, keynote speaker)

• ICDEA2020, Twentysixth International Conference on Difference Equations and Applications, Sarajevo, Bosnia and Herzegovina, July 27-31, 2020 New Dates: July 26-30, 2021

• ICAME'20, Balikesir, Turkey, June 24-26, 2020 (member of Scientific Committee) New Dates: June 30 - July 2, 2021

• CDDEA 2020, High Tatras, Slovakia, June 22-26, 2020 (member of Scientific Committee, plenary speaker) Delayed to 2021

• Dynamic Equations on Time Scales, Bedlewo, Poland, May 20-24, 2020 (member of Scientific Committee) New Dates: August 26-30, 2020 Pic

• ICMC Summer Meeting on Differential Equations, Sao Carlos, Brazil, February 3-5, 2020 (celebrating the 60th birthday of Tomas Caraballo)

• International Workshop on Differential Equations and Applications, Mother Teresa Women's University, Kodaikanal, Tamilnadu, India, January 28-29, 2020 (keynote speaker) Brochure Pic 1 / Pic 2

• ICMMCMSE2020, Alagappa University, Karaikudi, Tamilnadu, India, January 22-24, 2020 (keynote speaker) Pic / News

• International Conference on Differential and Difference Equations and Applications, Lisbon, Portugal, July 1-5, 2019 (invited speaker) Pic

• ICDEA2019, Twentyfifth International Conference on Difference Equations and Applications, London, UK, June 24-28, 2019 Pic

• APPLMATH2019, Messina, Italy, June 18, 2019 (invited speaker) Pic

• NUMTA2019, Numerical Computations: Theory and Algorithms, Crotone, Italy, June 15-21, 2019 (invited speaker)

• Dynamic Equations on Time Scales, Bedlewo, Poland, June 12-16, 2019 (member of Scientific Committee, plenary speaker) Pic Pic

• PODE2019, Progress on Difference Equations, Braganca, Portugal, May 27-30, 2019

• MAA Missouri Spring Meeting 2019, Lindenwood University, St. Charles, April 4-6, 2019 (plenary speaker)

• 8th ICMIS, Egypt, February 8-10, 2019 (member of Scientific Committee)

• ICMC Summer Meeting on Differential Equations, Sao Carlos, Brazil, February 4-6, 2019 (plenary speaker)

• The 7th Abu Dhabi University Annual International Conference: Mathematical, Physical Sciences & Engineering Applications Abu Dhabi, UAE, November 30 - December 2, 2018 (member of Scientific and Advisory Committee)

• 2nd IMA Conference on Theoretical and Computational Discrete Mathematics, Derby, UK, September 14-15, 2018 (invited speaker) Pic

• ICAAM 2018, Fourth International Conference on Analysis and Applied Mathematics, Lefkosa, Cyprus, September 6-9, 2018 (member of International Organizing Committee) Poster

• International Workshop on Nonlinear Dynamical Systems and Functional Analysis, Brasilia, Brazil, August 13-16, 2018 (plenary speaker)

• Bosnian Conference on Mathematical Sciences, Sarajevo, Bosnia and Herzegovina, July 12-14, 2018 (member of Scientific Committee, plenary speaker) Pic

• MIA Conference 2018, in honor of Prof. Pecaric's 70th birthday, Zagreb, Croatia, July 4-8, 2018 (member of Scientific Committee)

• Dynamical Systems, Difference and Functional Equations, Krynica-Zdroj, Poland, June 4-8, 2018 (member of Scientific Committee)

• Dynamic Equations on Time Scales, Bedlewo, Poland, May 30 - June 3, 2018 (member of Scientific Committee)

• ICDEA2018, Twentyfourth International Conference on Difference Equations and Applications, Dresden, Germany, May 21-25, 2018 Pic

• ICMTD17, Cairo, Egypt, December 28-30, 2017 (invited speaker)

• XI Congresso GAFEVOL, Brasilia, Brasil, October 23-26, 2017 (member of Scientific Committee) Pic

• BEER-2018, Normal, Illinois, October 6-8, 2017

• TREPAM2017, Recent Trends in Pure and Applied Mathematics, Alba Iulia, Romania, July 31 - August 4, 2017

• International Conference on Mathematical Modelling in Applied Sciences, Saint Petersburg, Russia, July 24-28, 2017 (member of Scientific Committee)

• ICDEA2017, Twentythird International Conference on Difference Equations and Applications, Timisoara, Romania, July 24-28, 2017 (Poster) Pic

• International Conference on Differential and Difference Equations and Applications, Amadora, Portugal, June 5-9, 2017 (main speaker)

• ICMME2017, International Conference on Mathematics and Mathematics Education, Sanliurfa, Turkey, May 11-13, 2017 (member of Scientific Committee)

• International Workshop on Mathematical Methods in Engineering, Ankara, Turkey, April 27-29, 2017 (member of Scientific Committee)

• IX Summer Workshop on Mathematics, Brasilia, Brazil, February 13-17, 2017 (Analysis Section) Inselair

• ICMC Summer Meeting on Differential Equations, Sao Carlos, Brazil, February 6-8, 2017 (plenary speaker)

• Workshop de Mathematica - Verao 2017, Juiz de Fora, Brazil, January 19-20, 2017 (plenary speaker)

• International Conference on Biotechnology and Bioengineering, Bangkok, Thailand, December 8-10, 2016 (member of Scientific Committee)

• Third International Conference on Analysis and Applied Mathematics (ICAAM 2016), Almaty, Kazakhstan, September 7-10, 2016 (member of International Advisory Board)

• The 2nd Conference on Ordinary Differential Equations and Dynamical Systems, Suzhou, China, July 25-27, 2016 (member of Technical Program Committee)

• ICDEA2016, Twentysecond International Conference on Difference Equations and Applications, Osaka, Japan, July 24-29, 2016

• International Conference on Applied Mathematics and Analysis in Memory of Gusein Sh. Guseinov, Ankara, Turkey, July 11-13, 2016 (plenary speaker) Pic

• ATA 2016, Cacak, Serbia, July 6-9, 2016

• New Trends in the Applications of Differential Equations in Science, NTADES 2016, Sofia, Bulgaria, July 4-9, 2016 (plenary speaker)

• 7th Podlasie Conference on Mathematics, Bialystok, Poland, June 8-11, 2016 (plenary speaker) Pic

• O.D. Equations Brno 2016, Conference in honor of Professor Dr. Ondrej Dosly on the occasion of his 60th birthday, Brno, Czech Republic, June 6-8, 2016 (plenary speaker) Pic

• ICRAPAM 2016, International Conference on Recent Advances in Pure and Applied Mathematics, Bodrum, Turkey, May 19-23, 2016 (Honorary Chair of Scientific Committee)

• PODE2016, Riga, Latvia, May 17-20, 2016 (member of Scientific Committee)

• ICMME2016, Interenational Conference on Mathematics and Mathematics Education, Elazig, Turkey, May 12-14, 2016 (member of Scientific Committee)

• 4th International Conference on Mathematical, Computational and Statistical Sciences, Barcelona, Spain, February 13-15, 2016 (member of Scientific Committee)

• International Meeting on Applied Mathematics, Errachidia, Morocco, May 9-12, 2016 (member of Scientific Committee)

• Encontro de Verao em Matematica Aplicavel na UNESP, Ilha Solteira, Brazil, October 19-23, 2015 (Program) Pic

• International Conference on Pure and Applied Mathematics 2015, Van, Turkey, July 23-26, 2015 (member of Scientific Committee)

• ICDEA2015, Twentyfirst International Conference on Difference Equations and Applications, Bialystok, Poland, July 20-25, 2015 (plenary speaker) Radio (Pic)

• Conference on Ordinary Differential Equations and Dynamical Systems, Shanghai, China, July 19-21, 2015 (member of Technical Program Committee)

• PODE2015, Covilha, Portugal, June 15-18, 2015 (Chair of Scientific Committee and plenary speaker)

• Joint International Meeting AMS/EMS/SPM, Porto, Portugal, June 10-13, 2015

• ICRAPAM 2015, International Conference on Recent Advances in Pure and Applied Mathematics, Istanbul, Turkey, June 3-6, 2015 (plenary speaker)

• Third International Conference on Applied Mathematics and Approximation Theory, Ankara, Turkey, May 28-31, 2015 (plenary speaker)

• International Conference on Differential and Difference Equations and Applications, Amadora, Portugal, May 18-22, 2015 (main speaker) Pic

• Conference on Partial Differential Equations, Munich, Germany, March 25-29, 2015 (member of Organizing Committee)

• Missouri Section of the MAA Spring 2015 Meeting, Rolla, Missouri, March 27-28, 2015 (plenary speaker)

• Summer Workshop on Differential Equations and Dynamic Equations on Time Scales, Ribeirao Preto, Brazil, February 19-20, 2015 (short course) (Poster) Pic

• VII Summer Workshop on Mathematics, Brasilia, Brazil, February 9-12, 2015

• ICMC Summer Meeting on Differential Equations, Sao Carlos, Brazil, February 2-4, 2015 (plenary speaker)

• The 3rd Abu Dhabi University Annual International Conference: Mathematical Science and Applications, Abu Dhabi University, Abu Dhabi, United Arab Emirates, December 27-30, 2014 (member of Scientific Committee)

• Symposium on Biomathematics and Ecology Education and Research, Claremont, California, October 10-12, 2014

• Second International Conference on Analysis and Applied Mathematics (ICAAM 2014), Shymkent, Kazakhstan, September 11-13, 2014 (member of International Advisory Board)

• Symposium on Differential Equations and Difference Equations 2014, Homburg, Germany, September 5-8, 2014 (scientific director)

• Third National Seminar on Applied Mathematics, Linyi University, Linyi, China, August 4-6, 2014 (plenary speaker), Opening of the Liu Hong Applied Mathematics Center Pic 1 2 3

• Conference on Dynamical Systems and Applications (dedicated to Professor Peter Kloeden on the occasion of his 65th birthday), Huazhong University of Science and Technology, Wuhan, China, July 26-30, 2014 (plenary speaker)

• ICDEA2014, Twentieth International Conference on Difference Equations and Applications, Wuhan Institute of Physics and Mathematics and Chinese Academy of Sciences, Wuhan, China, July 21-25, 2014 (plenary speaker) Pic

• The 10th AIMS Conference on Dynamical Systems, Differential Equations and Applications, Madrid, Spain, July 7-11, 2014 (organizer of a Special Session on Dynamics with Fractional and Time Scale Derivatives, jointly with Natalia Martins and Delfim Torres)

• CDDEA 2014, Jasna, Slovak Republic, June 23-27, 2014 (member of Scientific Committee)

• Conference on Partial Differential Equations, Abbazia di Novacella, Italy, May 28-31, 2014 (member of Organizing Committee) Pic

• ATA 2014, Vrnjacka Banja, Serbia, May 26-29, 2014 (member of Scientific Committee)

• PODE2014, Izmir, Turkey, May 21-24, 2014 (member of Scientific Committee and plenary speaker) (Poster) Pic

• Festcolloquium in honor of Professor Dr. Werner Kratz on the occasion of his retirement, Ulm, Germany, February 17, 2014 (plenary speaker)

• The 2nd Abu Dhabi University Annual International Conference: Mathematical Science and Applications, Abu Dhabi University, Abu Dhabi, United Arab Emirates, November 29 - December 1, 2013 (member of Scientific and Advisory Committee)

• Peterson Conference, Lincoln, Nebraska, October 25-27, 2013 (plenary speaker)

• Special Session on Fixed Point Theorems and Applications to Integral, Difference, and Differential Equations at the AMS Meeting #1092 (2013 Fall Southeastern Sectional Meeting), Louisville, Kentucky, October 5-6, 2013 (Talk on "Positive Periodic Solutions of Higher-Order Functional Quantum Difference Equations")

• Symposium on Differential Equations and Difference Equations 2013, Bayrischzell, Germany, September 1-5, 2013 (plenary speaker) Pic / Pic / Pic / Pics

• PODE2013, Bialystok, Poland, July 21-26, 2013 (member of Scientific Committee and plenary speaker) (Poster / Pic)

• Anatolian Communications in Nonlinear Analysis, Bolu, Turkey, July 3-6, 2013 (main speaker)

• The Cape Verde International Days on Mathematics 2013, Praia, Cape Verde, April 22-25, 2013 (member of Scientific Committee)

• International Conference: Mathematical Science and Applications, Abu Dhabi University, Abu Dhabi, United Arab Emirates, December 26-31, 2012 (member of Scientific and Advisory Committee)

• International Conference on the Theory, Methods and Applications of Nonlinear Equations, Texas A&M University, Kingsville, Texas, December 17-21, 2012 (main speaker and organizer of a Special Session)

• Symposium on Biomathematics and Ecology Education and Research, St. Louis, Missouri, November 9-11, 2012 (invited speaker and organizer of a Special Session) Pic

• Symposium on Differential Equations and Difference Equations, Abbazia di Novacella, Italy, October 28 - November 1, 2012 (plenary speaker) Pic

• First International Conference on Analysis and Applied Mathematics (ICAAM 2012), Gumushane, Turkey, October 18-21, 2012 (member of Scientific Committee)

• Mathematical Inequalities and Nonlinear Functional Analysis with Applications, Cheju Island, Korea, July 25-29, 2012 (member of Scientific Committee)

• International Conference on Pure and Applied Mathematics, Guelma, Algeria, May 28-30, 2012 (member of Scientific Committee and plenary speaker)

• Analysis, Topology and Applications 2012, Sombor, Serbia, May 25-27, 2012 (plenary speaker)

• International Conference on Applied Mathematics and Approximation Theory, Ankara, Turkey, May 17-20, 2012 (plenary speaker) (Poster)

• ICMC Summer Meeting on Differential Equations, Sao Carlos, Brazil, February 6-8, 2012 (plenary speaker)

• Special Session on "Dynamic Equations on Time Scales" at the AMS Meeting #1074 (2011 Fall Central Sectional Meeting), UNL, Lincoln, Nebraska, October 14-16, 2011

• International Conference on Differential and Difference Equations and Applications, Ponta Delgada, Azores, Portugal, July 4-8, 2011 (main speaker) (pics)

• International Conference on Applied Analysis and Algebra, Istanbul, Turkey, June 29 - July 2, 2011 (plenary speaker)

• The Sixth Ankara Math Days, Ankara, Turkey, June 2-3, 2011 (plenary speaker)

• Dynamical System Modeling and Stability Investigation, Kyiv, Ukraine, May 25-27, 2011 (member of Scientific Committee and plenary speaker) Abstract Book

• REMIA 2010, Plovdiv, Bulgaria, December 10-12, 2010 (member of Scientific Committee)

• Functional Differential Equations and Applications, Ariel, Israel, August 29 - September 2, 2010 (invited speaker)

• The 6th International Conference on Dynamical Systems and Applications, Antalya, Turkey, July 10-14, 2010 (member of Scientific Committee and plenary speaker)

• Analysis, Topology and Applications 2010, Vrnjacka Banja, Serbia, June 20-25, 2010 (plenary speaker)

• The 8th AIMS Conference on Dynamical Systems, Differential Equations and Applications, Dresden, Germany, May 25-28, 2010 (organizer of a Special Session on Differential, Difference, and Dynamic Equations, jointly with Stefan Hilger and Agacik Zafer)

• Festcolloquium in honor of Professor Dr. Donald A. Lutz on the occasion of his 70th birthday, San Diego, California, March 29, 2010 (organizer)

• MIA 2010: Mathematical Inequalities and Applications 2010, Lahore, Pakistan, March 7-13, 2010 (member of Scientific Committee)

• Joint Mathematics Meetings, San Francisco, California, January 13-16, 2010 (organizer of a Special Session on "Applications of Time Scales to Biology, Economics, and Engineering", jointly with Billur Kaymakcalan and Allan Peterson)

• Special Session on "Dynamic Equations on Time Scales" at the AMS Meeting #1051 (2009 Fall Central Sectional Meeting), Baylor University, Waco, Texas, October 16-18, 2009

• Equadiff 12, Brno, Czech Republic, July 20-24, 2009 (main speaker)

• Recent Developments in Dynamic Equations on Time Scales, Rocky Mountain Mathematics Consortium, summer school, Laramie, Wyoming, June 8-19, 2009

• SEARCDE28, 28th Annual Southeastern-Atlantic Regional Conference on Differential Equations, Little Rock, Arkansas, October 10-11, 2008 (plenary speaker)

• Symposium on Biomathematics and Ecology Education and Research, Normal, Illinois, September 6-7, 2008 (plenary speaker) Pic

• ICDEA2008, Fourteenth International Conference on Difference Equations and Applications, Istanbul, Turkey, July 21-25, 2008 (co-chair of organizing committee and chair of scientific committee)

• Conference in Honor of Allan Peterson, Abbazia di Novacella, Italy, July 28 - August 2, 2007 (plenary speaker)

• ICDEA2007, Twelfth International Conference on Difference Equations and Applications, Lisbon, Portugal, July 23-27, 2007

• Reaching and Teaching the Digital Native: The Digital Campus Institute @ Missouri, Columbia, Missouri, April 2-4, 2007

• Joint Mathematics Meetings, New Orleans, Louisiana, January 5-8, 2007 (organizer of a Special Session on "Dynamic Equations with Applications", jointly with Allan Peterson)

• ICDEA2006, Eleventh International Conference on Difference Equations and Applications, Kyoto, Japan, July 24-28, 2006 (main speaker)

• Marrakesh World Conference on Differential Equations and Applications, Marrakesh, Morocco, June 15-20, 2006 (plenary speaker)

• Web Conference on Feedback Devices and Effective Pedagogy, UMR, February 2, 2006

• Joint Mathematics Meetings, San Antonio, Texas, January 12-15, 2006 (organizer of a Special Session on "Dynamic Equations with Applications", jointly with Allan Peterson)

• Special Session on "Dynamic Equations on Time Scales" at the AMS Meeting #1011 (2005 Fall Central Sectional Meeting), UNL, Lincoln, Nebraska, October 21-23, 2005

• International Conference on Difference Equations, Special Functions and Applications, ICDEA2005, Tenth International Conference on Difference Equations and Applications, Munich, Germany, July 25 - 30, 2005 (plenary speaker)

• The First International Workshop on Dynamic Equations on Time Scales, Istanbul, June 27 - July 1, 2005 (organizer of conference, jointly with Okay Celebi and Mehmet Unal; plenary speaker)

• Joint International Meeting, Mainz, Germany, June 16-19, 2005 (organizer of a Special Session on "Ordinary Differential, Difference, and Dynamic Equations", jointly with Werner Balser and Donald Lutz)

• Easter Academy on Difference Equations, Special Functions and Applications, AbiTUMath 2005, Abbazia di Novacella, Italy, March 28 - April 1, 2005 (plenary speaker)

• Teaching Renewal Conference, University of Missouri-Columbia, February 24-26, 2005

• Joint Mathematics Meetings, Atlanta, Georgia, January 5-8, 2005 (organizer of an AMS-SIAM Special Session on "Dynamic Equations on Time Scales", jointly with Billur Kaymakcalan and Allan Peterson)

• 24th Annual Western Kentucky University Mathematics Symposium, Bowling Green, Kentucky, November 19-20, 2004 (main speaker), Dynamic Equations on Time Scales

• TA Development Using Case Studies: A Workshop for Faculty, AMS Meeting #1001 (2004 Fall Central Sectional Meeting), NWU, Evanston, IL, October 23-24, 2004

• Dynamical Systems and Applications, Antalya, Turkey, July 5-10, 2004 (plenary speaker)

• Special Session on "Dynamic Equations on Time Scales: Theory and Applications" at the AMS Meeting #996 (2004 Spring Western Sectional Meeting), USC, Los Angeles, California, April 3-4, 2004

• Joint Mathematics Meetings, Phoenix, Arizona, January 7-10, 2004 (organizer of a Special Session on "Time Scales and Applications", jointly with Billur Kaymakcalan and Allan Peterson)

• ICDEA2003, Eighth International Conference on Difference Equations and Applications, Brno, Czech Republic, July 28 - August 1, 2003

• The Fourth International Conference on Dynamic Systems and Applications, Atlanta, Georgia, May 21-24, 2003 (organizer of the Workshop on Time Scales and Applications jointly with Joan Hoffacker and Billur Kaymakcalan)

• Special Session on "Recent Trend of the Analysis and Computations of Functional Differential Equations" at the AMS Meeting #985 (2003 Spring Central Sectional Meeting), Bloomington, Indiana, April 4-6, 2003

• Time Scales Workshop, Dayton, Ohio, September 20-21, 2002

• Dynamic Equations on Time Scales and Their Applications, Rocky Mountain Mathematics Consortium, summer school, Laramie, Wyoming, July 8-19, 2002

• Special Session on "Dynamic Equations on Time Scales" at the AMS Meeting #975 (2002 Spring Southeastern Sectional Meeting), Atlanta, Georgia, March 8-10, 2002 (organizer of the Special Session jointly with Billur Kaymakcalan)

• Joint Mathematics Meetings, San Diego, California, January 6-9, 2002 (organizer of a Special Session on "Dynamic Equations on Time Scales", jointly with Billur Kaymakcalan)

• Special Session on Asymptotic Behavior of Solutions of Differential and Difference Equations at the AMS Meeting #970 (2001 Fall Southeastern Sectional Meeting), Chattannooga, Tennessee, October 5-6, 2001 (Talk on "Continuous and Discrete Oscillation")

• ICDEA2001, Sixth International Conference on Difference Equations and Applications, Augsburg, Germany, July 30 - August 3, 2001 (plenary speaker)

• SIAM SEAS Annual Conference, Myrtle Beach, South Carolina, March 16/17, 2001 (organizer of a Special Session on "Dynamic Equations on Time Scales", jointly with Billur Kaymakcalan)

• Special Session on Differential Operators and Function Spaces at the AMS Meeting #960 (2000 Fall Southeastern Sectional Meeting), Birmingham, Alabama, November 10-12, 2000 (Talk on "Laplace Transform for Time Scales")

• Midwest Differential Equations Conference, Moorhead, Minnesota, October 20-21, 2000 (plenary speaker)

• Fargo Preconference Workshop on BVPs and Oscillation Theory of Differential Equations on Measure Chains, Fargo, North Dakota, October 19, 2000

• Third World Congress of Nonlinear Analysts, Catania, Sicily, Italy, July 19-26, 2000 (organizer of a Special Session on "Time Scales", jointly with Ondrej Dosly)

• Special Session on Differential Inequalities and Applications at the AMS Meeting #953 (2000 Spring Central Sectional Meeting), Notre Dame, Indiana, April 7-9, 2000 (Talk on "Lyapunov Inequalities for Time Scales")

• San Diego Symposium on Asymptotics and Applied Analysis, San Diego, California, January 10-14, 2000

• ICDEA2K, Fifth International Conference on Difference Equations and Applications, Temuco, Chile, January 3-7, 2000

• Southern California Matrix Conference, San Diego, California, November 6, 1999 (Talk on "Positivity of Block Tridiagonal Matrices")

• Colloquium for Humboldtians from Illinois, Indiana, Iowa, Missouri, Alexander von Humboldt-Foundation, Chicago, Illinois (Palmer House Hilton & University of Chicago Campus), October 1-3, 1999

• The Third International Conference on Dynamic Systems and Applications, Atlanta, Georgia, May 26-29, 1999 (Talk on "Asymptotic Behavior of Dynamic Equations on Time Scales")

• Fourth Mississippi State Conference on Differential Equations and Computational Simulations, Mississippi State University, Starkville, Mississippi, May 21-22, 1999 (Talk on "Discrete Variational Analysis")

• Joint Mathematics Meetings, San Antonio, Texas, January 13-16, 1999 (Talk in the Special Session on "Discrete Models and Difference Equations": Trigonometric Transformations of Symplectic Difference Systems)

• Centennial Celebration, Department of Mathematics and Statistics, University of Nebraska-Lincoln, May 14-16, 1998 Talk in the Special Session on "Difference and Differential Equations": Asymptotic Behavior of Dynamic Equations on Time Scales)

• Joint Mathematics Meetings, Baltimore, Maryland, January 7-10, 1998 (participant in the Special Session on "Difference Equations and Applications")

• AMS Meeting 928, Albuquerque, New Mexico, November 8-9, 1997 (Talk in the Special Session on "Finite Differences and Functional Equations": Quadratic Functionals on Time Scales)

• Equadiff 9, Brno, Czech Republic, August 25-29, 1997 (Talk on "Quadratic Functionals on Time Scales")

• Seventh Colloquium on Differential Equations, Plovdiv, Bulgaria, August 1996

• Second World Congress of Nonlinear Analysts, Athens, Greece, July 10-17, 1996

• International Workshop on Difference and Differential Inequalities, Tübitak-Marmara Research Center, Gebze, Turkey, July 3-7, 1996

• AMS Meeting, Baton Rouge, Louisiana, March 1996

• General Inequalities 7, Oberwolfach, Germany, November 1995 (Talk on "Positive Definiteness of Discrete Quadratic Functionals")

• Herbsttagung Analysis und Zahlentheorie, Nago, Italy, September 25-29, 1995

• DMV Jahrestagung, Ulm, September 18-22, 1995 (Talk on "Riccatische Matrixdifferenzengleichungen und lineare Hamiltonsche Differenzengleichungssysteme")

• Second International Conference on Difference Equations and Applications, Veszprem, Hungary, August 7-11, 1995 (Talk on "Riccati Matrix Difference Equations and Linear Hamiltonian Difference Systems")

• Joint Mathematics Meetings, San Francisco, California, January 4-7, 1995 (Talk in the Special Session on "Difference Equations: Theory and Applications": Disconjugacy for Symplectic Systems)

• Herbsttagung Analysis und Zahlentheorie, Colfosco, Italy, September 26-30, 1994

• First International Conference on Difference Equations and Applications, San Antonio, Texas, May 25-28, 1994 (Talk on "Jacobi's Condition for Discrete Quadratic Functionals")

• Studentenkonferenz Mathematik, Humboldt Universität, Berlin, October 9-10, 1993

• Herbsttagung Analysis und Zahlentheorie, Colfosco, Italy, September 27 - October 1, 1993