Exclusive: As lawyers for Johnny Depp and his former law firm spar over a new trial date for the now $50 million malpractice lawsuit the Pirates of the Caribbean star brought against Bloom Hergott Diemer Rosenthal Laviolette Feldman Schenkman & Goodman Llp in 2017, there looks to be at least two fewer Hollywood heavyweights in the ring as of today.

Fifty-one years after he started practicing law, Jacob Bloom is retiring from the firm that already doesn’t carry his name, I’ve learned. His fellow founding partner Alan Hergott is also stepping down after years representing clients including Brad Pitt, Star Wars overlord Kathleen Kennedy, her husband producer Frank Marshall, and Neil Patrick Harris.

Hergott and Bloom, who represented Depp for two decades, have been sending emails to clients, current and past, informing them of their decision to move on to a new phase of their lives. As well as working for...