Jan van Wensveen was born in Jutphaas, and studied Illustration and Graphic Techniques at the Kunstnijverheidsschool, the forerunner of the Gerrit Rietveld Academy in Amsterdam, between 1951 and 1956. He began his career as a graphic designer and illustrator, working on both comics and animated cartoons. His art appeared in the magazine Vrij Nederland, the newspaper De Telegraaf and in production of the Toonder Studios. His best-known comics work was the 'Baron Bluff' feature, which was previously drawn by Albert van Beek and Frits Godhelp for Tom Poes Weekblad and Avrobode.
Van Wensveen's rendition of the strip was published in the regional newspapers of the Rotterdammer Kwartet in 1960-62, and probably reprinted in the magazine Taptoe in the early 1970s. Van Wensveen's comic story 'Avontuur In Midden Afrika' was printed in a Christian church magazine, and had the goal of attracting new missionaries. It was written by S.A. Doeveman and first published in book format in 1963. Jan van Wensveen focused on fine arts from 1965, and had an atelier in Haarlem. He was also a teacher at the Academy of Architecture in Arnhem from 1980 to 1984.