Mon, 06/17/2024 - 15:15 Tech Insider Scooter Braun speaks at the Billboard Power 100 event in 2023.Christopher Polk/Billboard via Getty Images Tags Entertainment, scooter-braun, Entertainment, Celebrity, taylor-swift, justin-bieber, demi-lovato, ariana-grande, Features Source Scooter Braun is retiring from music management after 23 years. Here's everythi…