Conversation so far:
What role did Povenmire play in Phineas and Ferb?
In 1993, Povenmire and Marsh conceived the series Phineas and Ferb, based on their similar experiences of childhood summers spent outdoors.
Was he a writer or illustrator on the show?
CANNOTANSWER.

Question: What was his role on the show?
Self-contained rewrite: What was Dan Povenmire's role on Phineas and Ferb?