From 1998–2000 Keshishian co-directed Parsegh Ganatchian Musical College. 2006 – 2009 he was the leader of Shnorhali choir of the Catholicosate of Cilicia (Antelias, Lebanon). In 2012 he participated in Esterazy international festival performing George Pelecis's "Ahoush's story" with the renowned "Cremereata Baltica" orchestra.