Starting in 2011, Rebhorn appeared in the Showtime series "Homeland" as Frank Mathison, father of the series' main character Carrie Mathison, played by Claire Danes. His character suffered from bipolar disorder like Claire's character did. However, he had been able to get it under control and became quite functional on a daily basis with the correct dosing of medications, and would often encourage Claire to do the same. Rebhorn's death in 2014 meant his character had to die in the show as well. The season 4 finale of "Homeland" was dedicated to him.