"Let's just say I'm with you every day, in every test tube, science book, and Petri dish." —to Jyoti in Making Magic "Take chances, make mistakes, and (get messy)!" —Professor Frizzle’s main motto Professor Valerie Felicity[1]Frizzle, PhD, or the Frizz, is a former third and fourth-grade schoolteacher at Walkerville Elementary School, and now an independent research professor. She is the older sister of Ms. Fiona Frizzle, who takes over teaching duties in Rides Again. She is voiced by Lily Tomli