LeRoy Holm is a former professor in the College of Agriculture at the University of Wisconsin, Madison.

Jerry Doll is Professor in the Department of Agronomy at the University of Wisconsin, Madison.

Eric Holm was formerly a researcher on remote sensing and geographic information systems with the United States Geological Survey at the Earth Resources Observation Systems Data Center (EROS) at Sioux Falls, South Dakota.

Juan Pancho is Professor Emeritus of the Department of Botany and Museum of Natural History at the University of the Philippines, Los Banos.

James Herberger was formerly a weed specialist with Imperial Chemical Industries (now Zeneca) in the United States.