Are  Jeff Mangum and Zack de la Rocha in the same industry?
Jeff Mangum Jeff Mangum (born October 24, 1970) is an American singer, songwriter, and multi-instrumentalist, best known for his work as the lyricist, vocalist and guitarist of the band Neutral Milk Hotel, as well as being one of the cofounders of The Elephant 6 Recording Company. He is best known for his complex, lyrically dense songwriting, apparent on the critically lauded album "In the Aeroplane Over the Sea".
Jeff Silverman Jeff Silverman is the president of Yuk Yuk’s, Canada's largest chain of comedy clubs. He has also been a concert promoter, former promoter at Toronto's historic Horseshoe Tavern as well as an author, publisher, business consultant, and graphic artist.