David C. Guth is a project engineer with Cooperative Farm Chemicals Association in Lawrence, Kansas. He received a B.S. degree in Physical Science in 1971 and an M.S. in Physical Science in 1975. He graduated from Kansas State University with a B.S. in Chemical Engineering in 1981, and has been working in the ammonia plant since that time.
Donald A. Clark is plant Superintendent with Cooperative Farm Chemicals Association in Lawrence, Kansas, where he is responsible for production and maintenance activities. He is a member of AIChE and ANSPG and has 28 years of production, engineering and maintenance experience in the nitrogen fertilizer industry.