This article lists contributors to this issue and provides brief biographies of them.

Alex Becker received a Ph.D. in physics from McGill University, Montreal, Quebec, Canada. After work as a field geophysicist with Canadian Sydicate and postdoctoral work at the Centre de Recherches Géophysiques in France, he joined the Geological Survey of Canada in 1965. Subsequently, he has been on the faculty of École Polytechnique, Montreal, where he was managing director of the Mineral Exploration Research Institute and director of research for Questor Surveys. He is now with the Department of Civil and Environmental Engineering, University of California, Berkeley, and is a faculty scientist at Lawrence Berkeley National Laboratory, Berkeley. His research interest is geophysical instrumentation of electromagnetic methods.

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