An actor's trifecta: Robert Grossman, a mainstay of local theater for 30 years, has three showcase roles this season BY MARTIN F. KOHN
In 1962, at the height of the great folk music boom, Elektra Records put out an anthology album featuring its top artists: Judy Collins, Theodore Bikel, Josh White, the Limeliters, Ramblin' Jack Elliott, Bob Grossman . . .<br /> Hold on. Who is Bob Grossman and whatever happened to him?<br /> <font size="1" face="Arial,Helvetica,Geneva,Swiss,SunSans-Regular" color=#9c0031">Thanks to <a href="http://www.americantheate…