Dr. Isobel Clark provides consultancy through Geostokos Limited, almost exclusively in the field of mineral resource and reserve estimation, most often at feasibility or even pre-feasibility stage. She has a B.Sc. (1969) in Pure and Applied Mathematics from Strathclyde University, an M.Sc. (1970) in Biometrics from University of Reading, a Ph.D. (1979) in Engineering from University of London, and a Diploma in Educational Broadcasting (1980) from University of York. She is a Fellow of the Royal Statistical Society, an Associate Member of the Biometrics Society, a Member of the Institution of Mining and Metallurgy, a Member of the International Association of Mathematical Geology, a Fellow of the Institute of Mathematics and its Applications, Associate Member of the Society of Mining Engineers of AIME, a Member of the Geostatistical Association of South Africa, and a Fellow of the South African Institution of Mining and Metallurgy.
Dr. Clark has taught at the Royal School of Mines at Imperial College, the Department of Mining Engineering at University of the Witwatersrand, and Camborne School of Mines at University of Exeter. She is the author of Practical Geostatistics (1979), co-author of Practical Geostatistics 2000 with William Harper, and author of numerous technical papers and short courses. Her major area of investigative study has been in the application of the "Theory of Regionalised Variables" in ore reserve estimation and other appropriate fields.