His father, Marc Platt, is a much bigger part of the industry than anybody really talks about. He's served as president of Orion Pictures, TriStar pictures, and Universal Studios. Marc Platt produced Legally Blonde, La La Land, Drive, Charlie St. Cloud, Scott Pilgrim Vs The World, and a lot of other award winning films. He is set to produce the film version of Dear Evan Hansen, as well as Disney's 'Cruella' along with their remake of Snow White and The Seven Dwarfs. He is also producing and possibly directing the Once On This Island film, the live-action Little Mermaid remake, and of course the Wicked film.
For Television he produced all of Fox's live musicals.
On stage he produced Wicked, If/Then, and War Paint.
He has also been linked to a shit ton of blockbuster films. Coincidentally, he has also produced or executive produced every single thing his son, Ben Platt, has ever done on stage or on film, with the exception of a few works of which Marc Platt is close friends with the creative teams behind, such as the Pasek and Paul musicals.