Ross made his Broadway debut in 1971 as Major Caldwell in Leon Uris's short lived musical Ari.
He returned to Broadway in 1981 to portray Larry Donovan and later Sam Craig in John Kander and Fred Ebb's Woman of the Year.
As Sam he got to play the romantic interest of the character Tess which was portrayed in turns by Lauren Bacall, Raquel Welch, and Debbie Reynolds during his lengthy stay with the show.
In 1984 he replaced Gene Barry as Georges in the original production of Jerry Herman's La Cage aux Folles.
In 1990 he replaced Jonathan Hadary as Herby in the revival of Gypsy, portraying the role opposite Linda Lavin's Rose.