He was born Mark Robert Luebke and grew up in San Jose, California, where he graduated from Oak Grove High School in 1970.
[1] 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[2] and appeared in feature films and television productions.