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Broader spectrum, fewer folks—gravity and magnetics from 1980 to the present

Marathon Oil Company, Houston, USA

When considering how to summarize the changes in gravity and magnetics during the last 25 years, I felt I needed a theme to bind the discussion together. I also wanted to include input from my gravity and magnetics (G&M) colleagues. I decided to use my career as the vehicle for my initial, rather philosophical, discussion of changes that I have seen in the business end of G&M. I end with a list of important technical advances since 1980. I want to offer my thanks to the dozens of G&M experts, professors, gurus, and friends that gave me input; many of the most arresting quotes have been inserted verbatim in the text at points where I felt they were particularly on target. I also recommend that you read the 75^th Anniversary technical summary with articles in the November/December 2005 issue of GEOPHYSICS.