He wrote at night and on weekends, ultimately publishing his first novel, Plan B, which attracted the attention of an agent, allowing him to leave his job and become a full-time writer.
Tropper's hometown of New Rochelle in Westchester County, New York, is a main source of inspiration when creating the characters and settings in his books.
In October 2017, it was announced that his series Warrior, based on Bruce Lee's original idea and set against the Tong Wars of 19th century San Francisco, received a straight-to-series order at Cinemax.
[6] In 2020, Tropper took over as showrunner and executive producer of the Apple TV+ science fiction series See (2019–present), starring Jason Momoa, Alfre Woodard, and Dave Bautista.
Shawn Levy directed, and the film co-starred Jason Bateman, Tina Fey, Adam Driver and Jane Fonda.
[10] Tropper wrote the screenplay for The Adam Project, a science-fiction thriller starring Ryan Reynolds and directed by Shawn Levy.