A native Kansan, Rodman was born in Eureka and grew up on a diversified farm and ranch near Toronto. His family raised cattle, wheat, soybeans, hay, and sorghum. He earned a bachelor of science degree in agriculture in feed milling from Kansas State University in 1963. He later graduated from the Minnesota Management Institute at the University of Minnesota.
Rodman served as an agribusiness executive in national and international agriculture development and management for the majority of his career. He worked for 37 years at Cargill, Inc., and gained experience in a number of agribusiness industries including milling, grain product processing, and meat slaughter and processing. Rodman spent four years as president of Tramco, Inc. a manufacturer of heavy duty dry bulk conveying systems located in Wichita. During his career, he lived in Europe and Asia and worked in more than thirty countries.
In the 1990s, Rodman worked with then-Kansas Secretary of Agriculture Sam Brownback to develop the value-added program and served as a board member of the Kansas Agricultural Value-Added Center.
Gov. Sam Brownback appointed Rodman to the KBA board in 2012.