Rick Rubin's resume runs deep. While he's sat at the helm of Kanye West's 'Yeezus' and contributes to Jay-Z's 'Magna Carta Holy Grail,' he's architected whole genres. Take hip-hop: along with Russell Simmons, he founded Def Jam Records in the early '80s and launched the careers of Beastie Boys, Run DMC and LL Cool J. His influence spread, landing him credits on albums from Johnny Cash, AC/DC and Lana Del Rey. Get familiar.