
Acting
Herbert Manfred "Zeppo" Marx (February 25, 1901 – November 30, 1979) was an American film star, theatrical agent and businessman. He was the youngest of the five Marx Brothers. He appeared in the first five Marx Brothers films, but then left the act to start his second career as a theatrical agent.
Description above from the Wikipedia article Zeppo Marx, licensed under CC-BY-SA, full list of contributors on Wikipedia.

The Marx Brothers: Hollywood's Kings of Chaos
as Self (archive footage)

Inside the Marx Brothers
as Self (archive footage)

Classic Comedy Teams
as Self (archive footage)

Oops, Those Hollywood Bloopers!
as Self (archive footage)

The Movie Orgy
as Self (archive footage)

Duck Soup
as Bob Roland

Hollywood on Parade No. B-5
as Self (archive footage) (uncredited)

Horse Feathers
as Frank Wagstaff

Monkey Business
as Zeppo

The House That Shadows Built
as Sammy Brown
The Cocoanuts
1929