Steijn first received training from Henk Gorter in Amsterdam before moving to Haarlem in 1935.
According to the RKD he was a pupil of Henri Boot in 1937 and then studied two years under Kees Verweij. He lived and worked in Assendelft, Oostzaan, Jisp and Wormer. After the war he met and married Janna Koolman, who worked for Henriëtte Louise Posthuma, the owner of the estate Groot Bentveld. He lived with her in one of the side wings of the estate where he kept his workshop.
In 1969 he was a member of the Haarlem artist society "De Groep", the Amsterdam Arti et Amicitiae, "Nederlandse Kring van Tekenaars", "De Keerkring", and "Beroepsvereniging van Beeldende Kunstenaars"(BBK) He signed his works "WSTEYN".
- Wim Steijn on website "Haarlemse Kunstschilders"