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Son of the pioneering ethnobotanist Jessie Williamson, Tom Williamson was born in Malawi and educated at schools in Africa and England. After gaining degrees in geology at Brasenose College, Oxford and geochemistry at the University of Leeds, Williamson worked as an exploration geologist for the gold and copper industries in Africa. Then he worked for a period at the Science Museum, London, producing in 1977 what was probably the world's first popular exhibition on climate change. Later Williamson returned to the metals field. Working for a UN agency, Williamson monitored the global tin industry, writing reports for governments. While making these studies of placer tin mining, in Brazil and elsewhere, Williamson also became interested in the placer mining of another more valuable metal, gold. It is the latter precious metal that, according to the missing science revealed in Probe, ET prospecting and mining bots may have focused on, when exploiting the placer metal resources of Earth and other earthlike planets.