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

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