Maxwell as an HTF Maxwell "Max" Doofenshmirtz is a son of Heinz Doofenshmirtz, friend of Vanessa Doofenshmirtz and founder of What a Doof! Productions. This article is a stub. You can help Phineas and Ferb Fanon by expanding it. Retrieved from "https://pffanon.fandom.com/wiki/Maxwell_Doofenshmirtz?oldid=270421" Categories: Article stubs Fanon Works Characters Males Community content is available under CC-BY-SA unless otherwise noted.