He starred in the short-lived series Barefoot in the Park (based on the Neil Simon play) and had a recurring role on Rhoda.

[6][7] He guest-starred in television series including The Mothers-in-Law, Here Come the Brides, That Girl, The Odd Couple, The Six Million Dollar Man, and Baretta.

In September 1970, ABC cast Mitchell in Barefoot in the Park based on Neil Simon's Broadway play of the same name.

During its first few episodes, Barefoot in the Park developed behind-the-scenes strife that sealed its fate: Mitchell was fired due to "differences of opinion" with the series' producers.

[citation needed] Mitchell died of kidney failure on March 19, 2022, in a hospice-care facility in Torrance, California.