[1][2] Härenstam hosted the Swedish version of the game-show Jeopardy!

Härenstam is also known for hosting the children's TV-program Fem myror är fler än fyra elefanter (with Brasse Brännström & Eva Remaeus), which was very popular and has been re-broadcast numerous times since it first aired.

Härenstam participated in the music video for ABBA's hit song "When I Kissed the Teacher" where he played the teacher who got kissed by Agnetha Fältskog.

Well known in Sweden for several decades, he was almost equally popular in Norway, having starred in the 1990s sitcom Fredrikssons fabrikk [no], playing the Swedish boss of a Norwegian textile workshop.

Härenstam died on 13 June 2015 after a several-year-long fight with cancer.