Long before Sean “Diddy” Combs‘ history of abuse came to light, alarm bells rang whenever Mark Ronson found himself around the now-disgraced hip-hop mogul.

“For all the gigs I played for Puff, he probably spoke five sentences to me. But even to me, the DJ, he emitted a chaotic energy that left me both starstruck and deeply unnerved,” Ronson writes in his new memoir, Night People: How to Be a DJ in ’90s New York City (out Tuesday, September 16), using Diddy’s former stage name Puff Daddy.

Ronson, 50, says it became “abundantly clear” to him in the mid-1990s that Diddy, 55, “wielded a tremendous amount of power and cachet” on the Manhattan club scene.

“He made people’s careers — playing gigs for him certainly helped mine — and his disapproval meant a certain kind of exile,” Ronson writes,

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