Gregory Tristan "Tris" Imboden (born July 27, 1951) is an American rock and jazz drummer. As a performer, he has been in studio sessions and on tour with some of the most notable and highest-selling musicians of all time. He was the drummer for the multi-platinum band Chicago from 1990 to 2018. He is a multi-platinum selling artist. As an educator, he has been a drum clinician and author of tutorial materials. Some of Imboden's most notable work include recordings with Neil Diamond, Kenny Loggins, Firefall, Richard Marx, Steve Vai, Roger Daltrey, Crosby, Stills & Nash, Chicago, Anita Baker, Julio Iglesias and Stevie Wonder. In addition he has toured the world with rock and jazz acts such as Kenny Loggins, Al Jarreau, Chaka Khan, Firefall, Cock Robin, Michael McDonald, Chicago, and other notable groups. As a full-time band member, Imboden's career has included Honk, the Kenny Loggins Band (including "Who's Right, Who's Wrong" featuring Michael Jackson, the six-time platinum Number One hit "Footloose", and "I'm Alright" from Caddyshack), and Chicago. His career with Chicago has seen the release of thirteen albums, several of them certified as platinum.