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Gregory Tristan "Tris" Imboden has drummed for bands such as Cock Robin, Honk, and Firefall. He was the drummer for Chicago from 1990 to 2018.
Among the bands Imboden has recorded and toured with are Neil Diamond, Kenny Loggins, Firefall, Richard Marx, Steve Vai, Roger Daltrey, Crosby, Stills & Nash, Chicago, Anita Baker, Julio Iglesias, Stevie Wonder, Kenny Loggins, Al Jarreau, Chaka Khan, and Michael McDonald.
As of 2022, Imboden was reportedly living in North County, San Diego.