**Some conferences that I have attended in the past and my talks:**

- Chromatic Number Via Turan Number, IPM Combinatorics and Computing Conference 2015, Institute for Research in Fundamental Sciences (IPM), Tehran, Iran, April 29-30, 2015.
- On the Altermatic Number of Graphs, Frontiers in Mathematical Sciences (3rd Conference), Institute for Research in Fundamental Sciences (IPM), Tehran, Iran, 29 December 2014 – 1 January 2015.
- Graph Colorings Via The Borsuk-Ulam Theorem, Mathematics Colloquium, Institute for Research in Fundamental Sciences (IPM), Tehran, Iran, October 29, 2014.
- Graph Homomorphisms Through Graph Powers, Midsummer Combinatorial Workshop XIX, Prague, Czech Republic, July 29 – August 2, 2013.
- On Biclique Covering, The Weekly Seminar of Combinatorics of IPM, Institute for Research in Fundamental Sciences (IPM), Tehran, Iran, January 18, 2012.
- Is it Possible to Evaluate the Quality of Scientific Journals?, Mathematics Colloquium, Institute for Research in Fundamental Sciences (IPM), Tehran, Iran, October 26, 2011.
- On Cover Free Family, IUT Combinatorics Day, Isfahan University of Technology, Isfahan, Iran, February 23, 2011.
- Graph Homomorphisms Through Graph Powers, International Conference on Recent Trends in Graph Theory and Combinatorics (A Satellite Conference of ICM 2010), Cochin, India, August 12-15, 2010.
- On Nesetril’s Pentagon Problem, HOMONOLO 2009 – Workshop on Graph Homomorphisms and Related Topics, Nova Louka, Czech Republic, November 23-27, 2009.
- Combinatorial Generalizations of the Borsuk-Ulam Theorem, Workshop On Topological Combinatorics, Shahid Beheshti University, Tehran, Iran, October 21, 2009.
- Graph Colorings Via The Borsuk-Ulam Theorem, Workshop On Topological Combinatorics, Shahid Beheshti University, Tehran, Iran, October 21, 2009.
- Visual Cryptography, 6th International ISC Conference on Information Security and Cryptology, Isfahan University, Isfahan, Iran, October 7-8, 2009.
- Graph Homomorphisms and Spectral Conditions, Weekly Seminars of Department of Computer Science, ETH, Zurich, Switzerland, June 7, 2007.
- Visual Cryptography, Weekly Seminars of Department of Mathematics, Zurich University, Zurich, Switzerland, April 11, 2007.
- Graphs Homomorphisms and Spectral Conditions, Workshop on Graphs, Morphisms and Applications, Barcelona, Spain, September 27-30, 2005.
- On Some Applications of Algebraic Topology in Combinatorics, Annual Iranian Mathematics Conferences(35th), Chamran University, Ahvaz, Iran, January 25-28, 2005.
- On no Homomorphism Conditions, Combinatorics, Linear Algebra, and Graph Coloring, Institute for Studies in Theoretical Physics and Mathematics, Tehran, Iran, August 9-14, 2003.
- Spares H-Colorable Graphs with Large Girth, ICM 2002, International Congress of Mathematics, Beijing, China, August 20-28, 2002.
- Chromatic Sum, Workshop on Colorings and Homomorphisms, PIMS, Vancouver, Canada, July, 2000.
- Clique Polynomial, Workshop on Colorings and Homomorphisms, PIMS, Vancouver, Canada, July, 2000.