1998 ROY, Kalyan Kumar (b. 1940) Ph.D.,F.I.G.U.,F.A.E.G.,F.M.G.M.I.,F.G.M.M.I., Professor of Geophysics, Department of Geology and Geophysics, Indian Institute of Technology Kharagpur – 721302; Res. Qtr.No.B-201, I.I.T. Campus, Kharagpur – 721302; Tel: 03222-83378(O), 83379(R); Fax: 82268, 55303; Email: ; Sp. Electrical and Electromagnetic Methods in Geophysics/Potential Theory/Inverse Theory.