John Ancrum, better known by his stage names Murda Mook and Mook, is an American rapper based out of Harlem, New York.
He is a veteran of East-Coast street rap battles, and has influenced the majority of modern battle rappers today. Alongside Troy "Smack White" Mitchell, he grew in popularity among fans of street hip-hop DVDs due to his delivery, crowd control, bars and consistency. He is considered a legend and a flag bearer for the primary era of battle rap
He is a founding member of the Harlem-based rap group Dot Mob, consisting of Mook, his cousin T-Rex, and Dutch Brown, affiliated with A&R Louie Da 13th. Former members included NymLo (known as NymDot at the time) and K-Shine. Associates include Watts rapper Daylyt, Pittsburgh rapper Real Deal, Baltimore rapper Tay Roc, and hype-man/producer Sho Gotti.