Occupation: Record executive, producer, philanthopist
Why so powerful: Geffen's record companies (Asylum and Geffen Records) have produced legendary artists like Cher, Bob Dylan, John Lennon, Joni Mitchell and many more. He is one of the original cofounders of
DreamWorks pictures along with Steven Spielberg and Jeffrey Katzenberg, though he left the company in 2008. Geffen is a prolific philanthropist, and he most famously donated $200 million to UCLA's medical school, which was subsequently named after him. As one of the richest men in the entertainment industry, Geffen is thought to have an estimated net worth of $4.6 billion.