In 1971 David Robert Guinnup received a Bachelor of Science degree in urban planning from Ball State University. He also graduated from Wright State University.
From 1972 to 1975 Donald Robert Guinnup was a planner for Henry-Hancock Community Action Program, Incorporated. From 1975 to 1978 Guinnup served as a director of Wyoming County Planning Commission in Pennsylvania, and Shelby County Regional Planning Commission in Ohio from 1978 to 1983. From 1983 to 1985 he worked as a research graduate assistant at the department of economics at Wright State University. Since 1984 Giunnup has been an economic and planning consultant. He is also a contributor articles to professional journals.
David Robert Guinnup is a member of the American Society Public Administration, American Institute of Certified Planners, American Planning Association, Kiwanis (Sidney), Theta Xi, Omicron Delta Epsilon.
On August 29, 1970 David Robert Guinnup married Diana Louise Stone,.