He is best remembered for his role as a detective Kokki in Matti Kassila's Komisario Palmu films and as a parrot G. Pula-aho in Spede Pasanen's radio programs.
[2] In 1960, Jokela appeared as a detective Kokki in Matti Kassila film Komisario Palmun erehdys.
A scene in which he sings a song Silmät tummat kuin yö has since become his signature moment in film.
For his role in Tähdet kertovat, komisario Palmu, he received a Jussi Award for best supportive actor.
[5] A biography Leo Jokela – vaatimaton sivuosien sankari (Modest star of supporting roles) was released in 2017.