Edmund C. Snodgrass started the first green roof nursery in the United States and has collaborated on green roof research with colleges and universities. A fifth-generation farmer and nurseryman, he is owner and president of Emory Knoll Farms Inc. and Green Roof Plants in Street, Maryland, specializing in plants and horticultural consulting for green roofs. Emory Knoll Farms Inc. has supplied plants for over 1 million square feet of green roof on more than 150 roofs in 20 states and the District of Columbia, as well as for green roofs in Canada, Hong Kong, Singapore, and Japan. Ed lectures widely on green roofs and is a member of the Maryland Nurserymen's Association, the Royal Horticulture Society, the American Horticultural Society, the Scottish Rock Garden Society, the Sedum Society, and the International Plant Propagators' Society.