Horton has had careers in biology, archaeology and publishing and farming, as well as writing and editing many articles and books.[2]
He joined the then Australian Institute of Aboriginal Studies (AIAS) (former name of the Australian Institute of Aboriginal and Torres Strait Islander Studies) as the Institute's osteologist in 1974, the following year taking on the role of paleoecologist. He was acting deputy principal at AIATSIS in 1984, and subsequently appointed manager of the Publications section, until he became Director of Publications in 1988–89 at Aboriginal Studies Press, the publishing arm of AIATSIS, a role he occupied until 1998.[1]
After retirement, he devotes his time to being a professional writer and farmer. Between 2008 and 2011, he wrote many opinion pieces for the ABC News website. He also published prolifically on a wide range of topics for the HuffPost until 2011.[2]
"AIATSIS map of Indigenous Australia"(map). Australian Institute of Aboriginal and Torres Strait Islander Studies. Published online by AIATSIS on 3 June 2015. 1996.