Allen Klein (December 18, 1931 July 4, 2009) was an American businessman, music publisher, writers' representative and record label executive. He was known for his tough persona and aggressive negotiation tactics, many of which affected industry standards for compensating recording artists. He founded ABKCO Music & Records Incorporated. Klein increased profits for his musician clients, who previously had been receiving less lucrative record company contracts. He first scored monetary and contractual gains for Buddy Knox and Jimmy Bowen, one-hit rockabillies of the late 1950s, then parlayed his early successes into a position managing Sam Cooke, and eventually managed the Beatles and the Rolling Stones simultaneously, along with many other artists, becoming one of the most powerful individuals in the music industry during his era.