[4][5] Before the Brady Bunch series, Knight had some small television roles, including an appearance on the first season of Mannix, in a 1967 episode called "Coffin for a Clown".

After the end of the Brady Bunch, Knight's acting career consisted mostly of making guest appearances on other television shows (Happy Days, The Love Boat), and occasional film roles (Just You and Me, Kid, Curfew, Good Girls Don't, The Doom Generation, and Nowhere).

In 1996, he joined the keyboard manufacturer Adesso, and in 1997, he became Vice President of Marketing at iXMicro, a video hardware company.

[2] Continuing to pursue TV opportunities, Knight appeared on VH1's fourth season of The Surreal Life.

During the 2008–09 television season, Knight hosted the syndicated game show, Trivial Pursuit: America Plays.

He has hosted a series of Jonathan Goodson-produced game show specials for the Michigan Lottery, Make Me Rich.

They were eliminated in the third episode, which aired as the October 3 "TV Theme Night" alongside Daymond John as "Fortune Teller".

[11] Knight proposed to his third wife, model and reality television personality Adrianne Curry, on the season finale of My Fair Brady, on VH1, which aired on November 6, 2005.