Deamer was the drummer of Hawkwind between 1983 and 1985. The band leader, Dave Brock, later said Deamer was "too professional", and he was replaced with Danny Thompson Jr.[3] Deamer was the drummer of the rhythm and blues revival group Big Town Playboys and appeared on albums including Crazy Legs (1993) with Jeff Beck.[4]
In 2000, Deamer formed the jazz band Get the Blessing with Jim Barr (bass), Jake McMurchie (saxophone) and Pete Judge (trumpet), in Bristol.[2] From 2001 to 2007, Deamer was a member of Robert Plant's backing band. He first met Plant at Plant's daughter's wedding in 1991 when Deamer was playing with Big Town Playboys.[9] He appeared on Plant's albums Dreamland (2002) and Mighty ReArranger (2005).[citation needed]
Deamer worked with the French singer Damien Saez on the albums God Blesse / Katagena (2002),[10]Debbie (2004)[11] and Paris (2008).[12] He participated in Saez's Yellow Tricycle project for the album To Lovers Prayer (2009).[13] In 2007, he recorded with Siouxsie Sioux on her album Mantaray.[14]
Since 2011, Deamer has toured with the rock band Radiohead as the second drummer.[15][16][17] Describing their 2012 tour for The King of Limbs, the Radiohead drummer, Philip Selway, said: "One [of us] played in the traditional way, the other almost mimicked a drum machine. It was push-and-pull, like kids at play, really interesting."[18] Deamer appeared on Radiohead's 2011 double single "The Daily Mail" and "Staircase"[19] and played additional drums on their 2016 album A Moon Shaped Pool.[20] In 2014, Deamer collaborated with Jonny and Colin Greenwood from Radiohead on the track "Under The Paving-Stones, the Beach!", on the soundtrack of the film Inherent Vice.[21]