Invited Addresses

• Mathematical Analysis and Its Applications, an international conference, Kuwait, March 1985, 1 hour.

• Orthogonal Polynomials and Applications, an international conference, Segovia (Spain), September 1986, 1 hour.

• Colombian Mathematical Society, Bogota, July 1987, 45 minutes.

• Ramanujan Birth Centenary Year International Symposium on Analysis, Pune (India), December 1987, 1 hour.

• Symposium on q-series, Institute of Mathematics and Its Applications, University of Minnesota, March 1988, 1 hour.

• The joint U.S.--Norway conference on continued fractions, University of Colorado, Boulder, June 1988, 1/2 hour.

• The NATO ASI on orthogonal polynomials and their applications, Ohio State University, Columbus, May 1989, a 3-hour slot.

• The Latin American Colloquium in Mathematics, Bogota, Colombia, November 1992, 1 hour.

• Analytic and computational problems in spectral theory of differential operators, Gregynog, Wales, July 1993, 1/2 hour.

• The Waleed Al-Salam Day, University of Alberta, September 1993, 45 minutes.

• Special Functions Day, Catholic University of Louvain, Belgium, October 1993, 1 hour.

• The First Stieltjes Colloquium, Free University of Amsterdam, November 1993, 1 hour.

• Approximation Theory Day, Cambridge University, England, November 1993, 1 hour.

• Conference on Signal Processing and Analysis, Cairo, Egypt, January 1994, 1 hour.

• Conference on Functional Differential Equations, Cairo, Egypt, January 1995, two 45-minute talks.

• The Lorch Symposium, York University, June 1995, 1/2 hour.

• The Rotafest, a conference at MIT, April 1996, 1/2 hour.

• Workshop on group theoretic methods in the theory of special functions, CRM, Montreal, June 1996, 1 hour.

• The annual meeting of the Danish Mathematical Society, Copenhagen, June 1996, 1 hour.

• Analytic and computational problems in spectral theory of differential operators, Gregynog, Wales, July 1996, 1/2 hour.

• Congress on Computational and Applied Mathematics, Louvain, Belgium, July 1996, 1 hour.

• British function theory meeting, Imperial College, London, September 1996, 1 hour.

• Six invited one-hour talks at Oberwolfach meetings.

• Distinguished Visitors Program to Colombia (ICFES), Lectures at the National University of Colombia, 10 lectures on Orthogonal Polynomials and Applications, 1989.

• Distinguished Visitors Program to Colombia (ICFES), Lectures at the National University of Colombia, 10 lectures on q-series, 1991.

• Distinguished lecture series “Frontiers in Mathematics,” Texas A&M University, March 1995, 3 lectures.

• A half-hour talk at the Centenary celebration of the first Ph.D. in Mathematics at the University of Wisconsin, 1997.

• Continued fractions and geometric function theory, Trondheim, Norway, June 1997, 1-hour talk.

• Third International Symposium on Difference Equations and Their Applications, Taipei, Taiwan, September 1997, 1-hour talk.

• Southwest Mathematical Physics Meeting, California Institute of Technology, Pasadena, February 1998, 1-hour talk.

• Fourier Analysis and Applications, Kuwait University, Kuwait, May 1998, 1-hour talk.

• The Third Conference on Symmetries and Integrability of Difference Equations (SIDE III), Sabudia, Italy, May 1998, 1-hour talk.

• Continued Fractions, University of Missouri at Columbia, Columbia, May 1998, 1-hour talk.

• Second Meeting of the Palestinian Mathematical Society, Birzeit, West Bank, August 1998.

• MSRI Workshop on Random Matrices, Stastical Mechanics and Integrable Systems, February 1999.

• The annual meeting of the Tunisian Mathematical Society, Hammat, Tunisia, March 2001, 1-hour talk.

• Distinguished Visitor's Program, University of Zulia, Zulia, Venezuela, two lectures, July 1997.

• Several half-hour talks at special sessions of the American and Canadian Mathematical Societies and SIAM.

• Many 1-hour Colloquium and Seminar talks at various universities.