Edward Plaster has taught horticulture and soil science for more than 30 years. He belongs to the American Society for Horticultural Science (ASHS) and the Soil and Water Conservation Society (SWCS). A former ASHS Certified Professional Horticulturist, Professor Plaster remains active in several national and local trade organizations, certification and accreditation programs, including the Minnesota Nursery and Landscape Association and Associated Landscape Contractors of America. Professor Emeritus from Dakota County Technical College, Mr. Plaster continues to make professional presentations about soils to various organizations.