Jeff Chimenti (born October 21, 1968) is an American keyboardist, best known for his ongoing work with RatDog. He is also a member of the post-Grateful Dead bands The Dead and Furthur.A native of the San Francisco Bay Area, Chimenti began playing piano when he was four and he studied formally from the age of seven to around the time he finished high school. Once he graduated from high school, he began playing in bands around the Bay area.