Protosevich was born in Chicago, Illinois and is an alumnus of Columbia College.
In late 1996, he wrote the script for the unproduced Batman Unchained, a mooted third film in the superhero franchise to be directed by Joel Schumacher.
[1] In 2011, Steven Spielberg met with Protosevich to discuss story ideas for a fourth film in the Jurassic Park franchise.
[3] He recently created the Apple TV+ series Sugar, which premiered on April 5, 2024, his first foray into television.
Protosevich currently lives on Cape Cod with his wife, the painter Robena Malicoat.