Peter Flack (b. 1946) wrote the episodes for Svenska Sesam with his then-wife Birgitta Götestam.
Flack also played the detective Holger Holm in a number of episodes.
He started his career as a theater producer and director at Riksteateren in Stockholm. He led productions such as My Fair Lady and Die Spanische Fliege.
In 1976, Flack wrote his first revue Rädda Hjalmar, in Örebro, with Birgitta Götestan. For the revue, he created the character Hjalmar Berglund, and he is still performing the character to this day.