[2] As well as his science-teaching duties at Milton Academy, Dewan directed various musical shows including a touring satirical student pop band.
Dewan's pen and ink and watercolor artwork complemented "Parker's examination of the morphology of the world's largest mammals" (and also Inside dinosaurs and other prehistoric creatures).
[4][5] Dewan next turned his hand to writing as well as illustrating, producing in 1994 a baseball version of The Three Billy Goats Gruff.
[6] More recently, his illustration work has featured in books related to the BBC comedy panel game television quiz show QI.
He co-developed the series, co-wrote the pilot, and wrote or contributed to most of the scripts, while working with the animators on set and character design.
The series has since become one of the most viewed programmes for children across the whole BBC, winning a BAFTA nomination and an International Emmy Award.
[9] His most recent commission was a sculpture and photography/design featured on the cover of Philip Selway's (Radiohead) second solo album, The Weatherhouse.