David Weidoff is an American actor best known for his role as Thom in the 2009 television series Roommates. His performance in this comedic show, which followed the lives of four young men sharing a house in Los Angeles, served as his primary claim to fame and introduced him to a wider audience. While details of his early life and training remain largely private, his work in Roommates marked a significant entry into the professional entertainment industry.

His career began with appearances in short films, building experience before landing the role on Roommates. The series, though short-lived, provided a platform that led to subsequent guest-starring roles on popular television programs. He appeared in an episode of the acclaimed crime drama Castle, sharing the screen with Nathan Fillion, and also guest-starred in The Mentalist, working alongside Simon Baker. These roles demonstrated his versatility in moving from ensemble comedy to procedural dramas.

Beyond television, Weidoff also pursued work in film. He appeared in the 2011 independent drama Answers to Nothing, a film featuring an ensemble cast that included Dane Cook, Elizabeth Mitchell, and Julie Benz. This project allowed him to explore a more dramatic character within a multi-narrative storyline. While he has maintained a relatively low public profile in recent years, his performances in Roommates and his guest spots on network television remain his most recognized contributions to the industry.