Sheldon Brown (July 14, 1944 – February 4, 2008) was an American bicycle mechanic and technical authority. He maintained a website containing articles relating to bicycle mechanics and maintenance, as well as a glossary of bicycling terminology. Brown wore a beard and often a plastic helmet-mounted eagle.
Sheldon Brown was "parts manager, webmaster and general tech guru" of Harris Cyclery, a bike shop in West Newton, Massachusetts. He was an enthusiast for old and unlikely forms of bicycles and cycling including Raleigh and English three-speed bicycles, the Sturmey-Archer hub in general, tandems, and in particular fixed-gear cycles. He repaired cameras, and was an accomplished amateur photographer and his site is illustrated with his work.
Brown wrote a guide to wheelbuilding, available on his website. He also established the mirror sites of the technical work of Damon Rinard and others.