 Hasse Prize, given by Mathematical Association of America, 2005 for my paper TicTacToe on a Finite Plane, Math Magazine, October 2004, 260  274.
 Provost's Award for Excellence in Scholarship, 2006.
 Invited speaker for the 60th Anniversary of the Korean Mathematical Society, October 2006.
 Plenary lecturer for International Conference on Coding and Cryptography, August 2011, Seoul, Korea.
 Plenary lecturer for ICAAA, 2012, Istanbul, Turkey.
 Plenary lecturer for Congress in NonCommutative Rings, Universite d'Artois, Lens, France, July 2013.
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