Marc van Iersel is an associate professor in floriculture physiology in the Department of Horticulture at the University of Georgia. He received his master's degree from Wageningen Agricultural University in the Netherlands and his doctoral degree from the University of Arkansas in 1994. In 1994 and 95, he worked as a postdoctoral researcher at Utah State University and joined the University of Georgia Department of Horticulture in 1995. He has a 100-percent research appointment and his main areas of interest are fertilization in closed recycling irrigation systems and the effects of environmental conditions on plant growth. He has a strong interest in mineral nutrition and measurements of crop photosynthesis as a nondestructive method to measure plant growth.

Jong-Goo Kang is a visiting scientist at University of Georgia and an assistant professor of floriculture at Sunchon National University in South Korea. He received a bachelor's and master's degree from Sunchon National University and holds a doctorate from Chonnam National University in South Korea. He worked as a post-doctoral researcher with the Rural Development Administration in South Korea and in 1996 became a full-time lecturer in the department of Department of Horticulture of Sunchon National University. He has been at University of Georgia as a visiting scientist since August 1999, where he collaborates with Marc van Iersel. He has both teaching and research responsibilities at Sunchon National University. His research focuses on hydroponic and aeroponic production of floriculture crops with an emphasis on the production of cut flowers.

Hannah Mathers is an assistant professor and extension specialist in nursery and landscape crops at Ohio State University, with statewide extension and research responsibilities. Previously, she had extension responsibilities for seven counties at Oregon State University North Willamette Research and Extension Center in Aurora, Ore. She has a bachelor's degree in plant science from Cornell University, a master's degree in horticulture from the University of Saskatchewan and holds a doctorate from Michigan State University. She has served as provincial nursery industry specialist in Alberta and British Columbia, Canada, and is a frequent contributor to nursery publications and speaker at industry functions. She has been awarded the Oregon Association of Nurserymen's Distinguished Education Award and Dedication to Excellence Award.

Bodie Pennisi is an extension floriculture specialist in the Department of Horticulture at the University of Georgia. She received her master's degree from University of Florida in 1996 and her doctoral degree from University of Florida in 1999. She joined University of Georgia's Department of Horticulture in 2000. Her program concentrates on developing and supporting an extension program serving the needs of the greenhouse floriculture industry in southern Georgia.

David R. Sandrock is a doctoral candidate in the Department of Horticulture at Oregon State University. His research focuses on using N15 isotopes and plant growth modeling to improve nitrogen use efficiency of container-grown woody ornamentals. He received a bachelor's and master's degree in horticulture from University of Georgia. He spent years in the landscape business, including owning his own firm, and managed a nursery for one year between degrees.

Steven A. Tjosvold has been a farm adviser in environmental horticulture with University of California Cooperative Extension in Santa Cruz and Monterey counties since 1983. He is involved with research, education and problem solving for the flower, nursery and landscape industries. His areas of research include reduced-risk pest management, rose powdery mildew, fertilizer management and sudden oak death syndrome. He has a bachelor's and master's degree in horticulture from University of California-Davis and has farm adviser training in Alameda, Orange and San Bernardino counties.

Tom Yeager is a University of Florida extension specialist focusing on woody ornamentals. He has three degrees in horticulture; a bachelor's degree from Auburn University, and a master's and doctoral degree from Virginia Tech. Long-term objectives of his research are to develop fertilizer regimens for the nursery industry that minimizes nutrient loss. He also focuses on helping container nurseries create efficient nutrient- and water-management strategies.

© 2001 Branch-Smith Publishing