Aaron Dufelmeier received an associate of science degree from Lincoln Land Community College, and a bachelor's degree in agricultural economics from the University of Illinois in 1994, specializing in farm management. While attending the U of I, Dufelmeier was an active member in the Alpha Chapter of Alpha Gamma Rho. Dufelmeier earned his master's degree in crop science at the U of I. He also was awarded first place for the Outstanding Graduate Student presentation at the 57th annual meeting of the North Central Weed Science Society.

Dufelmeier is currently the County Director for U of I Extension in the Calhoun, Cass, Greene, Morgan, Scott unit. He began serving in this capacity in October, 2002. Prior to this appointment, Dufelmeier served as the unit assistant in crop systems and horticulture from 1998 to 2000, and as a crop systems educator from 2000 to 2002. He also served as interim unit leader for the Cass-Schuyler unit during 2001.

Dufelmeier is actively involved and collaborates with several different agencies and organizations throughout the Unit, including Farm Bureau, Kiwanis, FSA, Jacksonville Chamber of Commerce, school districts, 4 Counties for Kids, Morgan-Scott-Greene Community Planning Group, and the Midwest Cattleman's Association.

Dufelmeier is a member of the Illinois Extension Agricultural Association and the National Association of County Agricultural Agents.

As a member of IEAA, Dufelmeier received the Action Award for the West Central Region. Dufelmeier has also received a certificate of professional development in crop sciences from the University of Illinois.

Aaron Dufelmeier provides leadership, mentorship, financial management, and personnel supervision to staff and volunteers for U of I Extension in Calhoun, Cass, Greene, Morgan, and Scott counties. He inspires and motivates Extension staff to create and deliver meaningful, value added, and research based educational programming to youth and adults. Aaron is improving the lives of his community’s residents by serving as the link between the people and the research at the University of Illinois.