Canadian-born David Steinberg, who has worn many hats during his entertainment career, first gained attention in the early 1960s as a member of Chicago's Second City comedy troupe. The acting career that followed placed him on Broadway in Jules Feiffer's "Little Murders" (1967) and "Carry Me Back to Morningside Heights" (1968), directed by Sidney Poitier, but the public came to know the dark and curly-haired comic primarily for his "sermons" on "The Smothers Brothers Comedy Hour" (CBS), for his "mad psychiatrist" sketch and for coining the popular phrase, "Boogah, boogah."A review by THE NEW