[5] His second project was Het nadeel van de twijfel, a short film, he co-wrote and was directed by Maarten Treurniet.
[6] His third and final project, Groeten uit Grasdijk, a short film he both wrote and direct, was a satire about a conflict between an alderman and an artist, who gives the municipality a pointless piece of art, a yellow sock on a clothesline.
[10][11] He co-wrote the last six episodes for Sjans with Peter Bolhuis, a show that was originally based on the British sitcom, Singles.
[12] Ketelaar next project was the short-lived comedy show called Achter de scherm broadcast on Veronica in 1995.
[14] Ketelaar next television film was De Trein van zes uur tien a 1999 thriller film, he directed based on a screenplay he co-wrote with Joost Prinsen and starring Peter Paul Muller, Roeland Fernhout, Rifka Lodeizen, Halina Reijn and Rudolf Lucieer.
The movie was created with the Telefilm program, a collaboration between independent filmproducers and various Dutch public broadcasters, to produce feature-length films for the small screen.
A story Ketelaar first conceived in 1995 that was inspired by Karin Adelmund, It follows Dirkje Holman, an inexperienced female minister who is expected to approve a law she doesn't agree with.
[24] His next television film was De uitverkorene, it revolves around the two brothers, Johan and Peter van der Laan, who own their own software company.
The film depicts the rise and fall of the company, the story was a loose interpretation of the downfall of the Baan Corporation.
[30] A year later, they would reunite again with Het Geheim, the story revolves around the eight year-old Ben (Thor Braun), a boy who loves magician and especially a big disappearance trick.
He gets in trouble when his good-natured but clumsy father (Theo Maassen) manage to make Ben's friend Sylvie (Java Siegertsz) disappear.
[33] It received critical acclaim, positive reception from audiences and it was awarded with two Golden Calves for Best Television Drama and Best Actress.
[36] He and Joram Lürsen would once again come together, this time for Reckless with Tygo Gernandt, Marwan Kenzari and Sarah Chronis in the lead roles.
[37][38] Ketelaar was tapped to write the screenplay for Blood, Sweat & Tears about the late Dutch singer André Hazes.
[40][41] Further that year, he wrote the script for the historical drama Public Works, directed by Joram Lürsen and based on the novel by Thomas Rosenboom.