Travanti's first credited role was in "Child of a Night", an episode of
Route 66. In 1964, Travanti guest-starred in the episode "Murder by Scandal" of
CBS's drama about newspapers,
The Reporter. He made his feature film debut in 1965 (credited as "Dan Travanty") playing a deaf mute nightclub bouncer in the psychological thriller
Who Killed Teddy Bear? starring
Sal Mineo and
Juliet Prowse. In 1965, he appeared in an episode of
Gidget as a photographer. In 1966, he played the role of radio talk show host Barney Austin in the
Perry Mason episode "The Case of the Midnight Howler". He (credited as Dan Travanty in all four) was the lead guest star in the Season 3 episode "Collision of Planets" of
Lost in Space in 1967, appeared in the episode "The Octopus" of the single-season crime drama
The Silent Force in late 1970, was featured in the Season 5 episode "Murder Times Three" of
Mannix in late 1971, and appeared in the Season 6 episode "Image" of
Mission: Impossible in early 1972. Also in 1972, he played a fugitive in the episode "The Devil's Playground" of
Cannon with future
Hill Street co-star
James B. Sikking. In 1974, Travanti appeared briefly in
The Bob Newhart Show episode "The Battle of the Groups". Also in 1974, he appeared in a
Gunsmoke episode, "Like Old Times", with his future
Hill Street co-star
Charles Haid. Travanti earned five nominations and two
Emmy Awards for his portrayal of Hill Street Station Captain
Frank Furillo. In 1982, Boston's
Emerson College chose him as the commencement speaker and gave him an honorary Doctorate degree. In 1983, Travanti starred in the TV movie
Adam, for which he received another Emmy nomination. He starred opposite
Sophia Loren in
Aurora (1984), which premiered on NBC and received a theatrical release in Italy. Travanti has appeared in a number of TV movies and has made appearances in television programs such as
Poltergeist: The Legacy (1997) and
Prison Break (2005). In 1986,
HBO broadcast the made-for-cable biographical film
Murrow, with his portrayal of
Edward R. Murrow receiving a
Cable Ace nomination. He co-starred in the film
Millennium (1989) and as Lt. Ray McAuliffe in the television series
Missing Persons (1993). From January to March 2007, Travanti appeared
off-Broadway in
Oren Safdie's
The Last Word... at the Theater at St. Clements in
New York City, and from November to December 2008, Travanti played the "Con Melody" in an off-off Broadway production of
Eugene O'Neill's
A Touch of the Poet for Friendly Fire Theater in New York. In 2010, he appeared in an episode of
Criminal Minds as a 75-year-old serial killer with
Alzheimer's disease. Travanti had a recurring role on the
Starz television series
Boss. He also appeared on
The Twilight Zone Radio Dramas as Captain William Fletcher in the audio adaptation of "
The Little People". Starting in 2017, he played the father of
Chris O'Donnell's character (
G. Callen) in
NCIS: Los Angeles. His final appearance, and final acting role to date, was in a 2019 episode of that series. ==Personal life==