Before his guest starring role on Young Sheldon, last season's off-Broadway production of The Portuguese Kid and of course nearly a decade as George Costanza on Seinfeld, Jason Alexander was a song and dance man on Broadway. He made his Broadway debut in Merrily We Roll Along in 1981, followed by a continual decade of shows The Rink, Broadway Bound, Jerome Robbins' Broadway in which he won a Tony Award for his perfor…
