A lifelong resident of Yuma, Rep. Dunn operates a family-run business, Dunn Grain Co Inc, which specializes in selling grains and exporting crops like garbanzo beans, black-eyed peas, Sudan grass, and wheat. He was named 2017 Arizona Farm Bureau "Farmer of the Year." Having been raised on a farm, Rep. Dunn has always had the desire to grow things and be innovative in business. a University of Arizona graduate with a BS in Agronomy, Dunn took his experiences growing up on a farm and brought them together with his schooling to take on new entrepreneurial enterprises.

A lifelong Republican, Rep. Dunn has proudly served as a Precinct Committeeman. He has also been an active voice on county issues related to agriculture. In 1999, the Yuma County Chamber of Commerce awarded him "Agricultural Person of the Year." Rep. Dunn was also appointed by the governor to the Arizona Department of Agriculture Advisory Board from 2006-2011 and served as Chairman in 2009. In addition to his service on this board, he served on various state and national committees from 1999 to 2015.

He is also a part of the Project Central Class of XI and Recipient of "Outstanding Leadership Award for Public Policy" 2009, as well as the 2009 Hear of Yuma Nominee.

Rep. Dunn still resides in his hometown of Yuma, along with his wife Eileen, and sons Kirk, 25 and Timothy Ty, 22. They are active in their church community, with Rep. Dunn having been a founding board member Champion Christian Church, where he has served as an officer since 2003. Representative Dunn's older son, Kirk, works on the farm in Yuma, and his younger son Ty has enlisted in the Air Force and is starting boot camp in 2018.