Attended Workshop on The Constraint Satisfaction Property: Complexity and Approximability at Dagstuhl, Germany (November) (2012).
Invited talk at the Conference on Universal Algebra and Lattice Theory at University of Szeged, Hungary (June) (2012).
Invited talk at special session on Universal Algebra and Lattice Theory at the University of Hawaii (March) (2012).
Invited talk at the program on algebraic approach to constraint satisfaction problems at the Fields Institute, University of Toronto (title: Finitely related clones and algebras with cube-terms) (2011).
Invited talk at the Algebra Seminar at the University of Szeged, Hungary (title: Finitely related clones and algebras with cube-terms) (2011).
Invited talk at ''The 2nd International Conference on Order, Algebra, and Logics, in honor of Ralph McKenzie, Hiroakira Ono, and Andrzej Wrośki'' (title: ''The number of Malcev clones is countable, a Taylor term requires only four variables, and other remarkable products of the fusion of finite universal algebra and constraint satisfaction theory'') (2011).
Talk to the algebra seminar at LaTrobe University, Melbourne, Australia (2011).
Invited talk at ''Jardafest'' International Conference on Algebras and Lattices, Prague, June (title: ''Inherently finitely related algebras and sparse relational clones'') (2010).
Invited talk at BLAST conference, Boulder, June (title: ''Inherently finitely related algebras and sparse relational clones'') (2010).
KAM Mathematical Colloquium (invited lecture to the Faculty of Mathematics and Physics of Charles University, Prague on March 11, 2010).
Invited talk at algebra seminar, Charles University, Prague on March 8, 2010.
Invited talk at Nowy Sad Algebra Conference, August, 2009.
Invited talk at AMS meeting in Urbana, March [invited talk at special session] (2009).
Invited talk at University of Georgia, Athens (CS Department) October (2008).
Mini-conference in algebra and algorithms at Sam Houston State University, April 18 [invited talk] (2008).
Participated and gave talk at the Workshop on the Algebraic Approach to Constraint Satisfaction Problems at AIM, March 31 - April 4 (2008).
Conference on Algorithmic Complexity and Universal Algebra, Szeged, Hungary, July [was unable to participate or give talk due to health emergency in family] (2007).
Opening talk at the Shanks workshop conference on The Algebraic Approach to Constraint Satisfaction Problems, Vanderbilt, June (2007).
American Mathematical Society, winter meeting in New Orleans, January [invited talk at special session] (2007).
Mathematics Colloquium at University of Colorado, October (2006).
Grätzer-Schmidt Conference, Erdös Center, Budapest, June (2006).
American Mathematical Society, winter meeting in San Antonio, January [invited talk at special session] (2006).
Midsummer Combinatorial Workshop Conference, DIMATIA Center, Charles University, Prague, July (2005).
Novi Sad Algebraic Conference, Novi Sad, Serbia, July (2005).
Conference on Universal Algebra and Lattice Theory, Szeged, Hungary, July (2005).
American Mathematical Society meeting in Nashville, October [twenty minute talk at special session on semigroups] (2004).
Walter Taylor Conference in Boulder, August (2004).
Logic Colloquium 2004 in Torino, Italy, July (2004).
Winter Meeting of the Canadian Mathematical Society in Vancouver, December [hour talk at special session] (2003).
American Mathematical Society meeting in Boulder, October [hour talk at special session] (2003).
NATO Advanced Study Institute, at the Universite de Montreal, July [a five-lecture workshop] (2003).
Annual Meeting of the Association for Symbolic Logic at the University of Illinois in Chicago, June [plenary talk] (2003).
Alfred Tarski Lectures at UC Berkeley (March 31, April 2, April 4) (2003).
University of Puerto Rico, March (2003).
Universita di Siena, June [seminar lecture] (2002).
AMS-UMI First Joint International Meeting, Pisa, June [hour lecture at special session] (2002).
Mycielski Conference, Boulder, May (2002).
International Conference on Modern Algebra, Vanderbilt, May (2002).
Oxford University, Mathematical Institute, October [two invited lectures] (2001).
Czech-Slovak Summer School, September [three plenary lectures] (2001).
Tame Congruence Workshop Conference, Erdös Center, Budapest, first two weeks of July 2001 [chairman of the conference, presented six lectures] (2001).
University of Novi Sad, June [Colloquium] (2001).
Charles University, Prague, June [Colloquium] (2001).
University of Wroclaw, June [Colloquium] (2001).
Tarski Centenary Conference, Warsaw, May [plenary talk] (2001).
AMS Meeting at Columbia, South Carolina, March (2001).
Fried Conference, Budapest, August (1999).
University of Wroclaw, July [Colloquium] (1999).
Universal Algebra and Lattice Theory Conference, Szeged, Hungary, August (1998).
University of Wroclaw, June [Colloquium] (1998).
University of Dresden, June [Colloquium] (1998).
University of Potsdam, June [Colloquium] (1998).
AMS Meeting at Louisville, March [special session] (1998).
International Congress in Algebras and Combinatorics, Hong Kong (1997).
Joint Mathematics Meeting, Pretoria, South Africa, June [hour talk at special session] (1997).
University of Capetown, South Africa, June [Colloquium] (1997).
International Conference on Modern Algebra and its Applications, Vanderbilt, May [plenary lecture] (1996).
University of Brisbane [twenty seminar talks] (1995).
University of Hawaii [Colloquium] (1995).
Magari Conference, Siena, Italy, April [plenary lecture] (1994).
Institut d'Estudis Catalans, Centre de Recerca Matemática, Barcelona, May [five lectures] (1994).
University of Nebraska [Colloquium] (1994).
UC Berkeley [Logic Colloquium] (1994).
Vanderbilt University, December [Colloquium] (1993).
Universal Algebras and Categories, MSRI, July [co-chair of the two-week workshop, presented one hour lecture] (1993).
Evelyn Nelson Lecture, McMaster University, Ontario, March (1993).
Pontifica Universidad Catolica de Santiago, Chile, February [six seminar talks] (1993).
UC Berkeley [Colloquium] (1992).
Alan Day Conference, McMaster University, Ontario (1992).
University of Colorado [Colloquium] (1990).
Summer Meeting of Canadian Math. Society, Halifax [plenary lecture] (1990).
Jónsson Symposium, Iceland [plenary lecture] (1990).
Victoria University, Wellington NZ [Colloquium] (1989).
University of Canterbury, Christchurch NZ [Colloquium] (1989).
Third International Conference on the Theory of Groups and Related Topics, Canberra [plenary lecture] (1989).
Maltsev Conference, Novosibirsk [plenary lecture] (1989).
Royal Melbourne Inst. Tech. [Colloquium] (1989).
Victoria Algebra Conference, Melbourne (1989).
Waterloo University [Colloquium] (1989).
University of Manitoba [seminar talk] (1988).
Technische Hochschule Darmstadt [seminar talks] (1988).
Math. Inst. Hungarian Acad. Sci, Budapest [several seminar talks] (1988).
International Conference on Algebra, Lisbon, Portugal (1988).
UC Berkeley [Logic Colloquium] (1987).
Conference on Algebra, Lattices, Logic, Asilomar (1987).
Harvey Mudd College, Claremont [Colloquium] (1987).
UC Riverside [Colloquium] (1987).
University of South Carolina [Colloquium and seminar talks] (1987).
The Citadel, Charleston (1987).
17th International Conference on Multiple-Valued Logic, Boston (1987).
University of Massachussetts, Amherst [Colloquium] (1987).
Second Molokai Conference, Hawaii (1987).
Fine Structure Conference, Berkeley [fourteen lectures] (1986).
Chico State University [Colloquium] (1986).
Simon Fraser University, Vancouver [Colloquium and seminar talks] (1986).
UC Berkeley [Logic Colloquium] (1985).
University of Calgary [seminar talk] (1985).
Iowa State University, Ames [Colloquium] (1985).
Conference on UA \& LT, at The Citadel, Charleston, SC (1984).
University of Siena, Italy [three-week course] (1984).
University of Siena, Italy [four talks at a conference] (1984).
First Molokai Conference, Hawaii [two talks] (1984).
University of Hawaii [fifteen weeks of seminar talks] (1984).
Workshop on UA \& LT, Szeged, Hungary (1983).
Charles University, Prague [Colloquium] (1983).
Waterloo University [seminar talks] (1983).
University of Colorado [seminar talks] (1983).
Vanderbilt University [one week of seminar talks] (1983).
International Conference on UA \& LT, Puebla, Mexico [one week of lectures] (1982).
UC Berkeley [Logic Colloquium] (1982).
Jónsson Symposium, Vanderbilt University (1981).
University of Colorado [Colloquium] (1980).
AMS Special Session on UA \& LT at University of Colorado (1980).
UC Berkeley [Logic Colloquium] (1980).
University of Hawaii [Colloquium and seminar talks] (1979).
Conference on Universal Algebra, Claremont (1978).
E.T.H., Zürich (1978).
Math. Inst. Hungarian Acad. Sci., Budapest (1978).
East-West Conference on Universal Algebra, Klagenfurt (1978).
Freie University, Berlin (1978).
University of Freiburg (1978).
University of Kassel (1978).
Technische Hochschule Darmstadt (1978).
Semester on Algebra at Banach Center, Warsaw [six lectures] (1978).
Vanderbilt University [seminar talks] (1977).
University of Calgary [Colloquium] (1975).
AMS Special Session on Game Theory, Washington, DC (1975).
UCLA [Logic Colloquium] (1975).
University of Washington [Colloquium] (1974).
UCLA [Logic Colloquium] (1973).
AMS Special Session on Lattice Theory, Houston (1973).
Erdös Symposium, Hungary (1973).
SUNY at Buffalo (1972).
Waterloo University [Colloquium and seminar talks] (1972).
University of Manitoba [Colloquium] (1972).
Tarski Symposium, Berkeley (1971).
McMaster University, Ontario [Colloquium] (1971).
AMS Summer Regional Conference at Pennsylvania State U. (1969).
Vanderbilt University [Colloquium] (1969).
UC Berkeley [Logic Colloquium] (1969).
Oberwolfach Conference (1968).
UC Berkeley [Logic Colloquium] (1967).
