He made his Broadway debut in Baker Street in 1965. Notable appearances include Count Carl-Magnus Malcolm in Stephen Sondheim's A Little Night Music, Curly in the 1979 revival of Oklahoma!, and as Don Quixote in several productions of Man of La Mancha.
[2] For the 1973 Shubert Theatre celebration of Stephen Sondheim—performed by such all-star performers as Angela Lansbury, Alexis Smith, Dorothy Collins, Chita Rivera, Glynis Johns, Hermione Gingold, Anthony Perkins, Larry Kert, and many others — Guittard sang "We're Gonna Be All Right", which was included on the live recording made of that special occasion, Sondheim: A Musical Tribute (1973).
[3] He lent his baritone voice and acting skills to the Broadway revival of She Loves Me and to the musical revue Rodgers and Hart.
In 1995, he again appeared in A Little Night Music, this time playing the role of Frederik opposite Judi Dench's Desiree at the Royal National Theatre.
[4] He co-starred opposite Donna McKechnie, Dee Hoty, and Tony Roberts in the acclaimed all-star 1998 revival of the Sondheim-Goldman musical Follies at the Paper Mill Playhouse.