- Chair of the scientific committee for the 7th Panhellenic Logic Symposium, held in Patras Greece, July 15-19, 2009.
- Member of the scientific committee for the international conference Residuated Structures: Algebra and Logic, held in Buenos Aires, Argentina, April 16-19, 2008.
- Co-chair of the organizing committee for the international workshop Proof Theory and Algebra, held at Vanderbilt University, March 6-8, 2008.
- Co-chair of the organizing committee for the International Conference on Order, Algebra, and Logics, held at Vanderbilt University, June 12-16, 2007.
- Member of the scientific committee for the International Symposium on Ordered Structures in Many-Valued Logic, held in Massa Lubrense, Italy, May 29-June 1, 2006.
- Organizer of the Workshop on Algebra and Logic, held at Vanderbilt University, March 7-8, 2006.
- Member of the international program committee of the Conference on Algebraic and Topological Methods in Non-Classical Logics II, held in Barcelona, Spain, June 15-18, 2005.
- Member of the organizing committee of the Conference on Residuated Structures and Multi-valued Logic, held at the University of Patras, Greece, June 2 - 5, 2004.
- Member of the organizing committee and Co-chair of the Conference on Ordered Algebraic Structures, held at Vanderbilt University, March 7-9, 2003.
- Member of the organizing committee of the International Conference on Modern Algebra, held at Vanderbilt University, May 21-24, 2002.
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