Heikki Johannes Silvennoinen was a Finnish guitarist, singer, songwriter and actor. Silvennoinen began his career with the rock band Tabula Rasa in 1972 but became widely known for the sketch series Kummeli, which began in 1991. Silvennoinen was one of the founding members and worked in the series as both an actor and a scriptwriter. From 2018 to 2023, he worked as a scriptwriter and second lead actor in the police comedy series Kontio & Parmas.