Rabb replaced George Grizzard, who left due to prior commitments, in the role of Tony Cavendish in the Broadway revival of The Royal Family shortly after the revival opened and appeared in the PBS production as well.
Following George Grizzard's exit from his role as Tony Cavendish in the Broadway revival of The Royal Family, Rabb took over the part shortly after the show started performing. He also made an appearance in a PBS television production.