His roles include Larry Dallas on the sitcom Three's Company, Richie in the later seasons of It's a Living and Jeff Beznick in Noah Knows Best.

Regional theater productions during this period included Chemin de Fer (in Chicago with actor Dennis Franz), Death of a Salesman, and Love's Labour's Lost.

[citation needed] On Three's Company, Kline played Larry Dallas, a sleazy playboy neighbor, used car salesman, and best friend to John Ritter's Jack Tripper.

In addition to his television and big screen appearances, Kline has hosted two game show pilots, Jumble in 1988 and To Tell the Truth in 1990.

[7] Kline played Kid Twist in the Paper Mill Playhouse world premiere production of The Sting starring Harry Connick Jr. which ran April 8–29, 2018.