March 2015 | Southern Regional Algebra Conference, University of Louisiana at Lafayette, Lafayette, Louisiana The Number of Irreducible Representations of a Hopf Algebra and the Projective Cover of the Trivial Module |

December 2014 | Seminar on Lie and Representation Theory, Mathematisches Seminar,
Christian-Albrechts University at Kiel, Kiel, Germany The 0-PIM and the Number of Irreducible Representations of a Restricted Lie Algebra |

April 2014 | Southern Regional Algebra Conference,
Auburn University at Montgomery, Montgomery, Alabama Pythagorean Triples and Complex Numbers |

April 2014 | Special Session on Linear Operators in Representation Theory
and in Applications, 2014 Spring Central Section AMS Meeting,
Texas Tech University, Lubbock, Texas On the [p]-Map of a Restricted Lie Algebra |

March 2014 | Colloquium, Department of Mathematical Sciences,
DePaul University, Chicago, Illinois Vector Products and Division Algebras |

March 2014 | Algebra and Combinatorics Seminar, Department of Mathematical Sciences,
DePaul University, Chicago, Illinois The 0-PIM and the Number of Irreducible Representations of a Restricted Lie Algebra |

February 2014 | Student Symposium Series, University of South Alabama, Mobile, Alabama Why Space is 3-Dimensional or the Scarcity of Vector Products and Division Algebras |

September 2013 | Algebra Seminar, University of South Alabama, Mobile, Alabama Vector Products, Composition Algebras, and Spheres II |

September 2013 | Algebra Seminar, University of South Alabama, Mobile, Alabama Vector Products, Composition Algebras, and Spheres I |

May 2013 | Dipartimento di Matematica e Applicazioni, Università degli Studi di Milano-Bicocca, Milano, Italy Lie Algebra Cohomology and Applications (6 lectures) |

November 2012 | Algebra Seminar, University of South Alabama, Mobile, Alabama Pythagorean Triples and Hilbert's Theorem 90 |

November 2012 | Florida Local Chapter MAA Meeting, University of West Florida, Pensacola, Florida Pythagorean Triples and Hilbert's Theorem 90 |

October 2012 | Special Session on Representations of Groups and Algebras, 2012 Fall Western Section AMS
Meeting, University of Arizona, Tucson, Arizona Restricted Lie Algebras with Maximal 0-PIM |

May 2012 | Seminario di Algebra, Università degli Studi di Milano-Bicocca, Milano, Italy Subadditive Functions and Dynkin Diagrams |

May 2012 | Dipartimento di Matematica e Applicazioni, Università degli Studi di Milano-Bicocca, Milano, Italy Support Varieties for Hopf Algebras (4 lectures) |

April 2012 | Algebra Seminar, Tulane University, New Orleans, Louisiana Quantum Lie Algebras |

March 2012 | 2012 Southern Regional Algebra Conference, Clayton State University, Morrow, Georgia Hom-Lie Algebras - Examples and Applications |

October 2011 | Special Session on Quantum Groups and Representation Theory, 2011 Fall Central
Section AMS Meeting, University of Nebraska-Lincoln, Lincoln, Nebraska Support Varieties and Representation Type of Self-Injective Algebras |

May 2011 | Bicocca-Workshop on Lie Algebras 2011, Università degli Studi di Milano-Bicocca, Milano, Italy Support Varieties and Representation Type of Small Quantum Groups and Hecke Algebras |

May 2011 | Dipartimento di Matematica e Applicazioni, Università degli Studi di Milano-Bicocca, Milano, Italy Simple Lie Algebras in Prime Characteristic (5 lectures) |

March 2011 | Algebra Seminar, University of South Alabama, Mobile, Alabama Composition Algebras and Alternative Division Algebras VII |

March 2011 | Algebra Seminar, University of South Alabama, Mobile, Alabama Composition Algebras and Alternative Division Algebras VI |

March 2011 | Algebra Seminar, Tulane University, New Orleans, Louisiana Support Varieties and Representation Type |

February 2011 | Algebra Seminar, University of South Alabama, Mobile, Alabama Composition Algebras and Alternative Division Algebras V |

February 2011 | Algebra Seminar, University of South Alabama, Mobile, Alabama Composition Algebras and Alternative Division Algebras IV |

February 2011 | Algebra Seminar, University of South Alabama, Mobile, Alabama Composition Algebras and Alternative Division Algebras III |

January 2011 | Algebra Seminar, University of South Alabama, Mobile, Alabama Composition Algebras and Alternative Division Algebras II |

January 2011 | Algebra Seminar, University of South Alabama, Mobile, Alabama Composition Algebras and Alternative Division Algebras I |

December 2010 | Algebra Seminar, University of South Alabama, Mobile, Alabama Vector Products and Composition Algebras |

November 2010 | Florida Local Chapter MAA Meeting, University of West Florida, Pensacola, Florida Vector Products, Division Algebras, and Spheres |

October 2010 | Southern Regional Algebra Conference, University of Louisiana at Lafayette, Lafayette, Louisiana Outer Derivations of Lie Algebras |

March 2010 | Southern Regional Algebra Conference, Auburn University at Montgomery, Montgomery, Alabama Split Chief Factors and 1-Cohomology for Lie Algebras |

November 2009 | Florida Local Chapter MAA Meeting, University of West Florida, Pensacola, Florida Power Sums and Bernoulli Polynomials |

May 2009 | Algebra and Combinatorics Seminar, Texas A&M University, College Station, Texas Complexity, Varieties, and Representation Type |

November 2008 | Florida Local Chapter MAA Meeting, University of West Florida, Pensacola, Florida Approximations of Square Roots: From the Babylonians until Today |

November 2008 | Algebra Seminar, University of South Alabama, Mobile, Alabama Complexity, Varieties, and Representation Type III |

November 2008 | Algebra Seminar, University of South Alabama, Mobile, Alabama Complexity, Varieties, and Representation Type II |

October 2008 | Algebra Seminar, University of South Alabama, Mobile, Alabama Complexity, Varieties, and Representation Type I |

September 2008 | 2008 Southern Regional Algebra Conference, University of Colorado
at Colorado Springs, Colorado Springs, Colorado Leibniz Algebras |

May 2008 | Special Session on Hopf Algebras and Quantum Groups, 2008 Spring Western
Section AMS Meeting, Claremont McKenna College, Claremont, California Support Varieties and Representation Type of Finite Quantum Groups |

April 2008 | Algebra Seminar, University of South Alabama, Mobile, Alabama Subadditive Functions and Dynkin Diagrams |

March 2008 | Special Session on Geometric and Combinatorial Representation Theory,
2008 Spring Southeastern Section AMS Meeting, Louisiana State University,
Baton Rouge, Louisiana Support Varieties and Representation Type of Finite Quantum Groups |

March 2008 | Special Session on Actions of Quantum Algebras, 2008 Spring Southeastern
Section AMS Meeting, Louisiana State University, Baton Rouge, Louisiana The Auslander-Reiten Quiver of Finite Quantum Groups |

November 2007 | Florida Local Chapter MAA Meeting, University of West Florida, Pensacola, Florida How to Prove the Irrationality of Roots of Integers |

November 2007 | Special Session on Lie and Representation Theory, 2007 Fall Southeastern
Section AMS Meeting, Middle Tennessee State University, Murfreesboro, Tennessee On the Cohomology of Modular Lie Algebras |

September 2007 | Southern Regional Algebra Conference, University of Louisiana at Lafayette, Lafayette, Louisiana Lie Algebras in which being an Ideal is a Transitive Relation |

June 2007 | International Conference on Rings and Things dedicated to Carl Faith
on his 80^{th} birthday and Barbara Osofsky on her 70^{th}
birthday, Ohio University - Zanesville, Zanesville, Ohio Injective Modules and Prime Ideals of Noetherian PI Rings |

May 2007 | Algebra Seminar, Department of Mathematical Sciences, University of Cincinnati,
Cincinnati, Ohio Poisson Superbrackets, Classical r-Matrices, and Cohomology |

May 2007 | Colloquium, Department of Mathematical Sciences, University of Cincinnati,
Cincinnati, Ohio Lie Bialgebras and the Classical Yang-Baxter Equation |

April 2007 | Colloquium, Department of Mathematics, University of South
Florida, Tampa, Florida Lie Bialgebras and the Classical Yang-Baxter Equation |

March 2007 | Robert C. Thompson Matrix Meeting, Auburn University, Auburn, Alabama Poisson Superbrackets, the Classical Yang-Baxter Operator,
and Determinants |

March 2007 | 2007 Zassenhaus Group Theory Conference, Saint Louis University,
Saint Louis, Missouri Lie Algebras of Cohomological Dimension One |

February 2007 | Algebra Seminar, University of South Alabama, Mobile, Alabama Deformations and Graded Lie Superalgebras II |

February 2007 | Colloquium, Department of Mathematics and Statistics,
Auburn University, Auburn, Alabama Lie Bialgebras and the Classical Yang-Baxter Equation |

January 2007 | Algebra Seminar, University of South Alabama, Mobile, Alabama Deformations and Graded Lie Superalgebras I |

January 2007 | AMS Special Session on Cohomology and Representation Theory, Annual Joint Mathematics Meeting, New Orleans, Louisiana Injective Modules and Cohomology of Lie Algebras |

November 2006 | Algebra Seminar, University of South Alabama, Mobile, Alabama Quantum Groups XI |

November 2006 | Algebra Seminar, University of South Alabama, Mobile, Alabama Quantum Groups X |

November 2006 | Southeastern Algebra Conference, Auburn University, Auburn, Alabama Frobenius Coalgebras |

October 2006 | Algebra Seminar, University of South Alabama, Mobile, Alabama Quantum Groups IX |

October 2006 | Algebra Seminar, University of South Alabama, Mobile, Alabama Quantum Groups VIII |

October 2006 | Algebra Seminar, University of South Alabama, Mobile, Alabama Quantum Groups VII |

September 2006 | Algebra Seminar, University of South Alabama, Mobile, Alabama Quantum Groups VI |

September 2006 | Algebra Seminar, University of South Alabama, Mobile, Alabama Quantum Groups V |

September 2006 | Algebra Seminar, University of South Alabama, Mobile, Alabama Quantum Groups IV |

September 2006 | Algebra Seminar, University of South Alabama, Mobile, Alabama Quantum Groups III |

September 2006 | Algebra Seminar, University of South Alabama, Mobile, Alabama Quantum Groups II |

August 2006 | Algebra Seminar, University of South Alabama, Mobile, Alabama Quantum Groups I |

April 2006 | Special Session on Lie Algebras and Applications, 2006 Spring Western
Section AMS Meeting, San Francisco State University, San Francisco,
California The Graded Lie Superalgebra Structure on the Hochschild
Cohomology of Truncated Polynomial Algebras |

November 2005 | Algebra Seminar, University of South Alabama, Mobile, Alabama Applications of Invariant Theory II |

November 2005 | Algebra Seminar, University of South Alabama, Mobile, Alabama Applications of Invariant Theory I |

November 2005 | Algebra Seminar, University of South Alabama, Mobile, Alabama Invariant Theory of Reductive Groups II |

October 2005 | Algebra Seminar, University of South Alabama, Mobile, Alabama Invariant Theory of Reductive Groups I |

September 2005 | Algebra Seminar, University of South Alabama, Mobile, Alabama Invariant Theory of Finite Groups |

September 2005 | Algebra Seminar, University of South Alabama, Mobile, Alabama Classical Invariant Theory |

June 2005 | Groups, Rings and Algebras, A Conference in Honor of Donald S. Passman’s
65^{th} Birthday, University of Wisconsin, Madison, Wisconsin Injective Modules over Universal Enveloping Algebras |

May 2005 | Lie Algebras, Vertex Operator Algebras and their Applications, A Conference
in Honor of Robert Lee Wilson and James Lepowsky on their 60^{th}
Birthdays, North Carolina State University, Raleigh, North Carolina Existence of Triangular Lie Bialgebra Structures |

March 2005 | Zassenhaus Group Theory Conference 2005, Auburn University at Montgomery,
Montgomery, Alabama On Groups and Associated Restricted Lie Algebras |

February 2005 | Algebra Seminar, University of South Alabama, Mobile, Alabama Injective Modules over Universal Enveloping Algebras |

February 2005 | Algebra Seminar, University of South Alabama, Mobile, Alabama Injective Modules over Noetherian Rings |

January 2005 | Algebra Seminar, University of South Alabama, Mobile, Alabama Prime Ideals in Non-Commutative Rings |

January 2005 | Algebra Seminar, University of South Alabama, Mobile, Alabama Lie Algebras and Universal Enveloping Algebras |

January 2005 | AMS Special Session on Modular Representation Theory of Finite and
Algebraic Groups, Annual Joint Mathematics Meeting, Atlanta, Georgia Extensions of Modules for sl _{2} |

November 2004 | 2004 Southern Regional Weekend Algebra Conference, Southeastern
Louisiana University, Hammond, Louisiana Existence of Triangular Lie Bialgebra Structures |

October 2004 | Algebra Seminar, University of South Alabama, Mobile, Alabama Existence of Triangular Lie Bialgebra Structures II |

October 2004 | Algebra Seminar, University of South Alabama, Mobile, Alabama Existence of Triangular Lie Bialgebra Structures I |

October 2004 | Algebra Seminar, University of South Alabama, Mobile, Alabama Lie Bialgebras and the Classical Yang-Baxter Equation |

September 2004 | Abelian Groups, Rings and Modules Conference in Honor of Edgar
E. Enochs, Auburn University, Auburn, Alabama Homological Properties of Universal Enveloping Algebras |

May 2004 | Lie Algebras, their Classification and Applications, Braunschweig University
of Technology, Germany Simple Lie Algebras of Cartan Type |

April 2004 | Algebra Seminar, University of South Alabama, Mobile, Alabama Sums of Squares and Integral Quaternions |

November 2003 | Weekend Algebra Meeting, Florida Atlantic University, Boca Raton,
Florida The Jacobson Radical of a Lie Algebra |

October 2003 | Algebra Seminar, University of South Alabama, Mobile, Alabama Spin Representations of Orthogonal Lie Algebras |

October 2003 | Algebra Seminar, University of South Alabama, Mobile, Alabama Clifford Modules |

October 2003 | Algebra Seminar, University of South Alabama, Mobile, Alabama Clifford Algebras and Orthogonal Groups |

October 2003 | Colloquium, University of South Alabama, Mobile, Alabama Clifford Algebras - Examples and Applications |

June 2003 | Representation Theory Around the Channel II, Jules Verne University
of the Picardie, Amiens, France Symmetric Powers of Modules for Finite Chevalley Groups and Frobenius
Kernels |

May 2003 | Algebra and Geometry Seminar, Otto-von-Guericke University Magdeburg, Germany Power Sums and Bernoulli Polynomials |

April 2003 | Colloquium, Department of Mathematics and Statistics, University of South
Alabama, Mobile, Alabama Representation Theory of Modular Lie Algebras |

April 2003 | Mobile Math Circle, University of South Alabama, Mobile, Alabama Power Sums and Bernoulli Polynomials |

April 2003 | Workshop on Hochschild Cohomology and Applications, University of Leicester,
England Homological Properties of Universal Enveloping Algebras in Prime Characteristic |

December 2002 | Mini-Conference on Computational Aspects of Group Theory, Aachen University
of Technology, Germany On Groups and Associated Lie Algebras |

November 2002 | Representation Theory Days, Kassel University, Germany Locally Finite Representations |

November 2001 | Representation Theory Days, Otto-von-Guericke University Magdeburg, Germany On the Number of Irreducible Representations of a Supersolvable Restricted Lie
Algebra |

June 2000 | Mathematics Seminar, University of the Bundeswehr at Hamburg, Germany Geometric Kinematics of Planar Mechanisms (5 talks) |

December 1999 | Colloquium, University of New Orleans, New Orleans, Louisiana Existence of Triangular Lie Bialgebra Structures |

November 1999 | Ring Theory Seminar, University of Louisiana at Lafayette, Lafayette, Louisiana Hopf Algebras - An Introduction Guided by Examples |

October 1999 | Thirtieth Annual University of Louisiana at Lafayette Mathematics (Algebra)
Conference, University of Louisiana at Lafayette, Lafayette, Louisiana Existence of Real Triangular Lie Bialgebra Structures |

June 1999 | Representation Theory Seminar Bielefeld-Chemnitz, Bielefeld University, Germany Projective Modules and Blocks of Supersolvable Restricted Lie Algebras |

September 1998 | Summerschool and Workshop on Springer Correspondence and Applications,
Picquigny, France Étale Topology and Cohomology |

September 1998 | International Conference on the Representation Theory of Algebras,
Bielefeld University, Germany Stable Categories of Tame Local Symmetric Algebras |

June 1998 | Representation Theory Seminar, University of Oxford, England Fock Spaces and Combinatorics |

May 1998 | Representation Theory Seminar, University of Oxford, England Construction of Affine Kac-Moody Algebras |

May 1998 | Algebra Seminar, University of Oxford, England Variations on a Theorem of Burnside |

March 1998 | Special Session on Cohomology of Finite Groups, 1998 Spring Central Section AMS Meeting,
Kansas State University, Manhattan, Kansas Cohomology of Restricted Lie Algebras and Finite Groups |

October 1997 | Summerschool Representation Theory, Willebadessen, Germany Support Varieties and Centralizers |

October 1997 | Summerschool Representation Theory, Willebadessen, Germany Support Varieties for Modules of Restricted Lie Algebras |

April 1997 | Colloquium, Utah State University, Logan, Utah |

April 1997 | Mini-Symposium on Lie Theory, Matrix Theory and Combinatorics,
Annual Meeting of the Intermountain Section of the Mathematical
Association of America, Utah State University, Logan, Utah Group Actions on Polynomial Algebras |

September 1996 | Workshop on Enveloping Algebras, Quantum Groups and
Representation Theory, Bielefeld University, Germany Variations on a Theorem of Burnside |

August 1996 | VIII. International Conference on Representation of Algebras, Geiranger, Norway Tensor Powers and Projective Modules for Hopf Algebras |

July 1996 | International Ring Theory Conference, Miskolc, Hungary Residual Nilpotency for Hopf Algebras |

May 1996 | Lie Algebra Conference, The Ohio State University, Columbus, Ohio Burnside's Theorem for Restricted Lie Algebras |

April 1996 | Special Session on Representations of Finite Groups, Algebraic Groups, and Lie Algebras,
1996 Spring Southeastern Section AMS Meeting, Louisiana State University, Baton Rouge, Louisiana The Principal Block of a Restricted Lie Algebra |

April 1996 | Colloquium, Florida Atlantic University, Boca Raton, Florida |

March 1996 | Weekend Algebra Conference, Texas A & M University, College Station, Texas Existence of Triangular Lie Bialgebra Structures |

March 1996 | Colloquium, The University of Alabama, Tuscaloosa, Alabama |

September 1995 | Annual Meeting of the German Mathematical Society, Ulm University, Germany On the Blocks of Supersolvable Restricted Lie Algebras |

July 1995 | Workshop on Quantum Groups and Lie Algebras, Ludwig-Maximilians University Munich, Germany Blocks of Supersolvable Restricted Lie Algebras |

July 1995 | Algebra Seminar, Ludwig-Maximilians University Munich, Germany Block Stability and Projective Modules for Finite Quantum Groups |

June 1995 | International Conference on Special Functions, q-Series and Related Topics,
Fields Institute, Toronto, Canada Representation Theory of Quantum Groups at a Root of Unity |

May 1995 | Quantum Group Seminar, The Ohio State University, Columbus, Ohio Simple Representations of the Quantized Universal Enveloping Algebra
of the Split Three-Dimensional Simple Lie Algebra |

May 1995 | Colloquium, University of South Alabama, Mobile, Alabama Complexity and Support Varieties of Restricted Lie Algebras |

May 1995 | Colloquium, University of New Orleans, New Orleans, Louisiana |

April 1995 | Weekend Algebra Conference, University of Southern Mississippi,
Hattiesburg, Mississippi The Module Type of Finite Quantum Groups |

March 1995 | Special Session on Lie Theory, 1995 Central Section AMS Meeting, DePaul University, Chicago, Illinois Block Stability and Projective Modules for Reduced Enveloping Algebras |

February - April 1995 | Algebra Seminar, The University of Alabama, Tuscaloosa, Alabama Quivers and Varieties in Representation Theory (series of talks) |

January 1995 | International Symposium on Lie Algebras and Representation Theory, Seoul National
University, Seoul, South Korea Modular Representations of Lie Algebras |

December 1994 | Mini-Conference on Computational Aspects of Representation Theory, Aachen
University of Technology, Germany On the Classification of Simple Lie Algebras over Fields of Prime Characteristic |

September 1994 | Summerschool Representation Theory, Pappenheim, Germany Standard Equivalences and Two-Sided Tilting Complexes |

August 1994 | VII. International Conference on Representations of Algebras, Cocoyoc, Mexico Locally Finite Representations for Modular Lie Algebras |

June 1994 | Canadian Mathematical Society Annual Seminar, Banff International Research Station, Banff, Canada Tensor Products and Indecomposable Modules for Hopf Algebras |

June 1994 | Algebra Seminar, University of Alberta, Edmonton, Canada Representations of Quantum Groups at Roots of Unity |

April 1994 | Representation Theory Seminar, Bielefeld University, Germany Tensor Products and Blocks of Reduced Enveloping Algebras |

Januar 1994 | Colloquium, Siegen University, Germany The Module Type of Finite Quantum Groups |

September 1993 | Workshop on Quantum Groups, Hesselberg, Germany Tilting Modules for Quantum Groups and Applications (two talks) |

June 1993 | III. International Conference on Non-Associative Algebra and Its Applications,
University of Oviedo, Spain Some Conjectures in the Block Theory of Restricted Lie Algebras |

February 1993 | Lie Theory Seminar, University of Wisconsin, Madison, Wisconsin Modular Representation Theory and Finite Quantum Groups |

December 1992 | Nineteenth Holiday Symposium, New Mexico State University, Las Cruces,
New Mexico Modular Representation Theory and Finite Quantum Groups |

November 1992 | Algebra Seminar, The Ohio State University, Columbus, Ohio The Module Type of Restricted Lie Algebras |

November 1992 | Colloquium, The University of Alabama, Tuscaloosa, Alabama |

September 1992 | Colloquium, University of Wisconsin, Milwaukee, Wisconsin Representations of Quantum Groups at Roots of Unity |

July 1992 | International Conference on Invariants and Representation Theory,
Université Pierre et Marie Curie, Paris, France The Block Structure of Reduced Enveloping Algebras |

April 1992 | Conference on the Structure and Representation Theory of Lie Algebras
in Honor of the 60^{th} Birthday of Professor George B. Seligman,
Yale University, New Haven, Connecticut On the Block Structure of Some Restricted Lie Algebras |

March 1992 | Colloquium, The University of Alabama, Tuscaloosa, Alabama |

February 1992 | Algebra Seminar, Northwestern University, Evanston, Illinois The Blocks of Restricted Lie Algebras |

February 1992 | Colloquium, University of Wisconsin, Milwaukee, Wisconsin |

February 1992 | Lie Theory Seminar, University of Wisconsin, Madison, Wisconsin Homological Topics in the Representation Theory of Restricted Lie Algebras
(3 talks) |

September 1991 | Annual Meeting of the German Mathematical Society, Bielefeld University,
Germany Complexity and the Module Type of Restricted Lie Algebras |

August 1991 | International Algebra Conference, Barnaul, Russia Injective Modules over Modular Universal Enveloping Algebras |

July 1991 | Summerschool Representation Theory, Geseke, Germany Generalized Morita Equivalence |

May 1991 | Mathematical Research Institute Oberwolfach, Germany The Module Type of Some Classes of Algebras |

February 1991 | Mathematical Research Institute Oberwolfach, Germany Restricted Lie Algebras with Bounded Cohomology |

September 1990 | Annual Meeting of the German Mathematical Society, Bremen University, Germany On the Representation Theory of Modular Lie Algebras |