Bob Einstein—the comedian, writer, and actor best known for his role as Marty Funkhouser on “Curb Your Enthusiasm” and for his Super Dave Osborne character—died today at the age of 76 following a a cancer diagnosis, New York Daily News reports. On Twitter, Radiohead guitarist Jonny Greenwood has shared a tribute. “So sad to hear this,” he writes. “He was amazing in ‘Curb.’”

Greenwood then reveals that he has checked in to hotels on the past two Radiohead tours using the name Marty Funkhouser, “in tribute to his beautifully pitched performance. So subtle. And to think it was all improvised.” To prove it, Greenwood also shares a welcome letter from the Park Hyatt Chicago addressed to Marty Funkhouser. See it below.