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Thomas has been vice president of the Royal Anthropological Institute since 2007, is a fellow of the Society of Antiquaries of London, has been professor of archaeology at the University of Manchester since 2000, and is former secretary of the World Archaeological Congress.
He served as Director of the Institute of Archaeology at University College London (UCL), and was a Fellow of both the Royal Anthropological Institute and the Society of Antiquaries.
Gough Kathleen, "Female Initiation Rites on the Malabar Coast", Journal of the Royal Anthropological Institute, No. 85, 1952.