Since 1991: Chief Scientist, Bord na Mona Research, 1976 - 1991: Group Leader, Soils &Plant Nutrition, New Zealand Ministry of Agriculture, Research Division, 1972 - 1975: Agricultural Chemist Caroni Research Station Trinidad, West Indies, 1971 - 1972: Consultant, The Agricultural Institute, Dublin, 1968 - 1971: Post Doctoral Fellow, The Agricultural Institute, Dublin
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