NICK E. CHRISTIANS, PhD, is professor of Horticulture at Iowa State University. He is the author of numerous books, including The Mathematics of Turfgrass Maintenance, Fourth Edition, and Mathematics for the Green Industry.

AARON J. PATTON, PhD, is associate professor of Horticulture at Purdue University, West Lafayette, Indiana. He also serves as the executive director of the Midwest Regional Turf Foundation.

QUINCY D. LAW, MS, is a doctoral student in the Department of Horticulture and Landscape Architecture and the Ecological Science and Engineering Interdisciplinary Graduate Program at Purdue University.