Neustadter has been married to Lauren Rachelle Levy since October 9, 2010. The couple has one son.
Neustadter and Weber wrote the script for The Disaster Artist (2017), the adaptation of the book of the same name. They also wrote Our Souls at Night, an adaptation of Kent Haruf's final novel of the same name, for Netflix, with Robert Redford and Jane Fonda playing the lead roles, the first movie they have made together since 1979's The Electric Horseman.
