John W. Colburn, Jr., is co-founder, president, and chief executive officer of Crop Technology, Inc., an agricultural electronics company that develops and markets Prescription Farming™ technologies including the Soil Doctor® System. Mr. Colburn is a Texas Registered Professional Engineer who earned his M.S. in mechanical and aerospace engineering and materials science from Rice University. He holds a number of U.S. and foreign patents in the field of precision agriculture emphasizing on-the-go sensing and variable rate application.

Ralph E. Heimlich is the geographic information systems team leader for the Natural Resources and Environment Division of the Economic Research Service at the United States Department of Agriculture, where he has worked since 1976. Mr. Heimlich is an accomplished economist with considerable expertise in the areas of land use and conservation. He received a Master of city planning and M.A. in regional science from the University of Pennsylvania.

Deborah A. Joseph is an associate professor of computer science and mathematics at the University of Wisconsin-Madison. Her research interests include computational problems in molecular biology, complexity theory, and mathematical logic-recursion theory. She received the Presidential Young Investigator Award from the National Science Foundation in 1985. Joseph earned a Ph.D. in computer science from Purdue University.

John B. LeBoeuf is a certified professional agronomist who works as the senior safety officer and pest control adviser for Fordel, Inc. Mr. LeBoeuf initiated the remote sensing project at Fordel, Inc., the first company in California to have a significant portion of its acreage using National Aeronautics and Space Administration technology. He is an active member of the American Society of Agronomy, California Agricultural Production Consultants Association, and California Melon Research Board. Mr. LeBoeuf received a B.S. in plant science from Utah State University.

Erik Lichtenberg is an associate professor with the Department of Agricultural and Resource Economics at the University of Maryland-College Park. His research includes study of the use of pesticides and other chemicals and their effect on agricultural economics. In 1993-1994, Dr. Lichtenberg served as the senior economist for agriculture, natural resources, and international trade for the President's Council of Economic Advisers. He received his Ph.D. in agricultural and resource economics from the University of California-Berkeley.

David A. Mortensen is an associate professor of agronomy at the University of Nebraska-Lincoln. Dr. Mortensen is a well-known weed ecologist and dedicated teacher whose principal research interests include plant ecology and weed management and the development of weed-crop modeling software. He received the



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