He co-wrote the screenplay The Last Lullaby[1] (with Max Allan Collins)[2] and wrote and directed the short film Ceremonies of the Horsemen [3] (starring Richard Schiff and Josh Zuckerman).
The short was selected to be part of the permanent archive at the Visual Center of Yad Vashem in Jerusalem.
[4] Biegen has written for Lifetime television, ghost written on several projects, is a member of both the Writers Guild of America and the Writers Guild of Canada, and a 2014 fellow of the Sundance Institute.
[6] Biegen has developed film projects with Michael Apted, Rodrigo Garcia, Julie Lynn, Eric Stoltz and Don Was (among others).
In 2024 he was awarded a Monson Arts Residency for his writing, and was shortlisted for The Letter Review Prize in Nonfiction[10] for his piece on the 2022 mass shooting in an LGBTQ+ nightclub in Colorado Springs.