[4][5] He is best known for playing baby-faced Private Billy Nelson in the American drama television series Combat!.
[6] Lowell then appeared in the sitcom television series The Lucy Show, where he played the recurring role of Alan Harper.
In the same year, Lowell appeared in the 1962 film Mr. Hobbs Takes a Vacation, which starred James Stewart and Maureen O'Hara.
He also appeared in the film The Manchurian Candidate, which starred Frank Sinatra, Laurence Harvey and Janet Leigh.
In later years, Lowell taught acting at private schools in the Los Angeles area.