Dennis Riddle has been named president -- ADM Corn Processing. Riddle joined the company in 1999 and previously served as division senior vice president -- Sweeteners & Starch in the ADM Corn Processing division. He received a Bachelor of Science degree in business administration from High Point University and a MBA from Duke University.
Mark Kolkhorst has been named president -- Specialty Feed Ingredients. Kolkhorst joined ADM in 1986 and previously served as vice president -- Specialty Feed Ingredients. He has held various management positions in grain merchandising, as well as vice president of both ADM/Growmark and Tabor Grain. Kolkhorst received a Bachelor of Science degree in agri-business from Illinois State University in Normal, Ill.