David Eigenberg is an American actor. His acting career started in the 1990s on the small screen. His first recurring part was in the TV series Homicide: Life on the Street. He next appeared in the movie The Practice. He also worked as a voice actor, playing the part of Nermal in Garfield. He later guest-starred in an episode of ER, as well as starred in the film Daybreak. He later made appearances in The King of Queens, Ghost Whisperer, and NCIS. He then became known for starring as Steve Brady in Sex and the City. Since 2012, he’s been starring as Christopher Herrmann in Chicago Fire.