The Collaborative International Dictionary of English v.0.48:
Strategist \Strat"e*gist\, n. [Cf. F. strat['e]giste.] One skilled in strategy, or the science of directing great military movements. [1913 Webster]WordNet (r) 3.0 (2006):
strategist n 1: an expert in strategy (especially in warfare) [syn: strategist, strategian]