 Alexander co-starred opposite Sherie Rene Scott in the September 2017 world premiere of John Patrick Shanley's "The Portuguese Kid" at the Manhattan Theatre Club.Alexander is best known as one of the key cast members of the award-winning television sitcom "Seinfeld", on which he played the bumbling but lovable George Costanza (Jerry Seinfeld's character's best friend since childhood).Alexander was nominated for seven Primetime Emmy Awards and four Golden Globe Awards for his performance as Costanza, but did not win any, mainly due to his co-star Michael Richards being nominated and winning for his role as Cosmo Kramer.