Mark Alley is the W. G. Wysor Professor Emeritus at Virginia Tech, where he conducted research in fertilizer use efficiency and improved agronomic crop production techniques. Research included soil sampling strategies for variable rate lime and fertilizer applications as well as work with N fertilizer placement, timing, and formulations. He taught courses in soil fertility and fertilizers and soil plant relationships at the undergraduate and graduate levels, and conducted numerous seminars with growers and agribusiness personnel. Mark currently does consulting research and training in the areas of improved fertilizer technology and use, and increasing crop production efficiency. He has worked and lectured in North and South America, Europe, and Asia. Mark is a Fellow of the American Society of Agronomy, the Soil Science Society of America, the American Association for the Advancement of Science, and the Fluid Fertilizer Foundation. He served as president of the American Society of Agronomy in 2009.