799th AMS, East Lansing, Michigan, 1982.

809th AMS. Louisville, Kentucky, 1984.

LMS/NATO Advanced Study Institute, Lancaster, England 1984.

Function Theory and Operator Theory Conference, Virginia Polytechnic Institute and State University, 1985.

Universitaet Karlsruhe, Germany, 1985, 1986.

Banach Algebras and Operator Theory Conference, Poland, 1985.

University of Southwestern Louisiana, Louisiana, 1986.

West Chester University, Pennsylvania, 1986.

State University of New York at Stony Brook, New York, 1987.

Universitaet Bern, Switzerland 1988.

Universitaet Karlsruhe, Germany 1989.

German Math Society Congress, Karlsruhe, Germany 1989.

George Mason University, 1989.

Conference on Function Spaces, Southern Illinois University at Edwardsville, 1990.

Universitaet Karlsruhe, Germany 1992.

Tagung der Function Theorie, Giessen, Germany 1992.

AMS Meetings, San Antonio, Texas, 1993.

Second Conference on Function Spaces, Southern Illinois University at Edwardsville, Illinois, 1994.

AMS Meeting 896, University of Richmond, Virginia, 1994.

AMS Meeting, San Francisco, California,1994.

Mathematical Science Research Institute, Berkeley, California, 1995.

Universitaet Zuerich, Switzerland, 1995.

Universitaet Bern, Switzerland, 1995.

Universite de Metz, France, 1996.

Universitaet Bern, Switzerland, 1996.

AMS Milwaukee Meeting, Wisconsin, 1997.

AMS Winston Salem Meeting, North Carolina, 1998.

Oberwolfach, Germany, 1999.

Vassar College, New York, 2000.

AMS Meeting, San Francisco, 2000.

Nigata University, Nigata, Japan, 2001.

Colloquium (for department), Bowling Green University, Ohio, 2002.

Colloquium for students, Bowling Green State University, Ohio, 2002.

Fourth Conference on Function Theory, University of Southern Illinois at Edwardsville, Illinois, 2002.

Colloquium, Universitaet Bern, Switzerland, 2003.

Seminar, Universitaet Bern, Switzerland, 2003.

Colloquium, University of Fribourg, Switzerland, 2003.

Colloquium, Universitaet Saarbruecken, Germany, 2003.

AMS Meeting, North Carolina, 2003 (session on function theory and operator theory).

AMS Meeting, North Carolina, 2003 (session on Banach algebras and several complex variables).

AMS Meeting, Vanderbilt University, Tennessee, 2004.

Susquehanna University, Pennsylvania, 2005.

Villanova, Pennsylvania, 2005.

Banach algebras and their applications, Bordeaux, France, 2005.

Spaces of holomorphic functions and their operators , CIRM Luminy, France, 2006.

Universidad de Zaragoza, Zaragoza, Spain, 2007.

Teaching Day, Laval, Quebec, 2007. Writing with Latex, by Dan Flath, Macalester College, pdf file of talk .

Banach algebras 2007, Laval, Quebec, 2007.

NBFAS, Leeds, England, 2007.

Washington University (in honor of Richard Rochberg), St. Louis, 2008.

Leeds, England, 2008.

Talks at Bucknell University

Voting Strategies, A Pi Mu Epsilon Coffee Talk.

Sprouts and Brussels Sprouts, A Pi Mu Epsilon Coffee Talk.

The Dreydle Game, A Pi Mu Epsilon Coffee Talk.

Logic Problems, A Pi Mu Epsilon Coffee Talk.

Proofs Without Words, A Pi Mu Epsilon Coffee Talk.

Fixed Point Theorems and Finite Blaschke Products, Pi Mu Epsilon Initiation Ceremony.

False Proofs, Prospective Student Day.

Calculus at Bucknell University, Prospective Student Day.

A mathematician with principles and problems, Pi Mu Epsilon Induction Ceremony.

Proofs without words, Pi Mu Epsilon..

A mathematician with principles and problems (for beginners), Prospective Student Day.

The Josephus Problem, Prospective Student Day.