John Williamson (economist), senior at Institute for International Economics; John Williamson (singer), an Australian singer John Williamson (basketball), a previous agent basketball player with a New York Nets. John Williamson (politician), a 19th century New Zealand politician John Williamson (geologist), a Canadian geologist and developer of the Williamson diamond mine in Tanzania (d. 1958) Jack Williamson, an American science fiction writer John Finley Williamson, conductor, musician, & co-founder of Westminster Choir College.