He landed the lead of Sam Briggs on the sitcom Worst Week. He starred with Alyssa Milano on the TV sitcom Romantically Challenged. The series premiered on ABC on April 19, 2010, but ABC officially cancelled the series on May 16, 2010.
In 2016, Bornheimer appeared on the CBS sitcom Angel from Hell. His feature film credits include She's Out of My League, You Again, and Bachelorette. He and Kathy Baker signed to appear in Judd Apatow's Netflix series Love.