Mark Lambert (born January 19, 1952) is an American actor and singer.After moving to Los Angeles, Lambert made a single episode appearance of Room 222. He went on to guest star in a variety of television shows, including The Mod Squad, The Partridge Family, and Ironside. He made his Broadway-theatre début in New York City originating the role of Henrik Egerman in the musical-theatre production of A Little Night Music (1973-74) with music and lyrics by Stephen Sondheim and book by Hugh Wheeler. After Night Music closed, Lambert moved back to California and appeared in feature films and television productions.