After studying at Malmö Theatre Academy between 1969 and 1973, Falk worked in children's theater in Norrköping.

[3] In the mid 1980s, Falk along with Helge Skoog brought improvisational theatre to Stockholm's stadsteater.

Falk also worked on improvisational theatre in other media, such as being a panel member in the Sveriges Radio show På minuten.

He made his début in Svart gryning  [sv], a film on the disappearance and murder of Dagmar Hagelin.

[6][7] Falk became well known for his role as cabinet secretary Peter Sorman in the show Fiendens fiende.