Herbert Manfred "Zeppo" Marx (February 25, 1901 – November 30, 1979) was an American actor, theatrical agent, and engineer. He was the youngest of the five Marx Brothers. He appeared in the first five Marx Brothers feature films, from 1929 to 1933, but then left the act to start his second career as an engineer and theatrical agent. Zeppo Marx was a multi-millionaire due to his engineering efforts.