American accountant and publisher.
The co-owner of National Allied Publications, which later became DC Comics.
The other co-owner National Allied Publications, Harry Donenfeld, was also Jewish. The two worked with Max Gaines (also Jewish) on "All-American Publications", which later merged into National Allied Publications/DC Comics.
Jack Liebowitz - Wikipedia
Jack Liebowitz, Comics Publisher, Dies at 100 - The New York Times (2000, Archived)