Johan Heinrich (Joop) Doderer (28 August 1921 – 22 September 2005)[1] was a Dutch actor, well known for his role as the tramp Swiebertje in the eponymous television series.

Instead, he started his acting career as an extra at the Nederlandsch Toneel, which enabled him to study actors like Cor van der Lugt Melsert.

He also acted in some movies (Het Wonderlijke leven van Willem Parel, 1959) and featured on the radio (De bonte dinsdagavondtrein and Koek en ei).

[2] In 1979, he played a South African agent in The Human Factor, directed by Otto Preminger, alongside Richard Attenborough, Derek Jacobi and John Gielgud.

In the 1990s Doderer finally succeeded in shedding his comedian image, and played serious roles in Dutch theatres under the direction of Ivo van Hove and Ger Thijs.