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A bass player with jazz leanings, who had studied at Berklee College of Music, Marker was a member of the Rising Sons between 1964 and 1966, along with Ry Cooder and Taj Mahal. A 1992 retrospective CD has been issued of their work, Rising Sons on Columbia CK 52828.
During this time he became friendly with Don Vliet. He helped with Vliet's musical education  and played with Captain Beefheart and his Magic Band on a number of occasions but was unwilling to kowtow to the large Beefheart ego on a regular basis.
Marker was involved in the early production work on Safe As Milk, but this material did not feature on the final issue. He stood in for Jerry Handley on bass at live shows during 1964-67 and joined the Magic Band for a short spell in 1968-69 ("Moonlight On Vermont" and "Veteran's Day Poppy" from Trout Mask Replica are the only two surviving tracks which feature his bass playing - a third track, a reworking of 'Kandy Korn', has disappeared). This archived track resides among the 'Brown Wrapper' project.
Two other bands of his, the Jazz Folk and the New World Jazz Company (which also included John Locke, Randy California and Ed Cassidy before moving on to form Spirit), were never recorded. His band Fusion recorded a 1969 album entitled Border Town which featured Ry Cooder.
In 1978, he featured on an album by Juicy Groove, alongside vocalist Michael Rainbow Neal (ex-The Seeds), guitarists Mars Bonfire (ex-Steppenwolf), Elliot Ingber (ex-Mothers of Invention and Magic Band) and drummer Thundercloud, son of former bandmate Ed Cassidy.
He has played in numerous bands (and with many performers) over the years, been a regular session musician as well working as an engineer/producer. He's now retired from the music business but still maintains an active interest (especially in Beefheart-related matters).
- Kirkeby, Marc (1992). Rising Sons (sleevenotes to Sony CD 472865 2).
- Barnes, Mike (2000). Captain Beefheart. London: Quartet Books. p. 27. ISBN 0-7043-8073-0.
- Barnes, Mike (2000). Captain Beefheart. London: Quartet Books. p. 97. ISBN 0-7043-8073-0.