Mr. Stoppable is Ronald "Ron" Stoppable's father and a good friend of Dr. James Possible. He is the father of Ron Stoppable. He is an actuary which allows him to work anywhere. Ron has mentioned that his dad has allergies to nearly every kind of animal hair, which led to Ron buying Rufus the naked mole-rat when he was a little boy. Mr Stoppable is Jewish, as it was confirmed in "Bad Boy".