Born in New Zealand in 1921, Jack moved to the UK to undertake his PhD, examining distribution of fungi through soil profiles at Lakenheath Warren, in the University of Cambridge's botany department.
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He worked as a member of the Botany Department in the UK Forestry Commission until 1951, when he accepted a position as a senior microbiologist in the Department of Plant Pathology at the then Waite Agricultural Research Institute, University of Adelaide where he worked until his retirement in 1986.
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