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Dennis Garrison has been in the stone, sand, and gravel industry for over 30 years. Dennis started their career as president of The Melvin Stone Co. in 1983. In 1985, they became president of the Processed Limestone Association. Garrison then moved on to the Ohio Aggregates and Industrial Minerals Association, where they served as president from 2005 to 2006. In 2007, they became director of the National Stone, Sand & Gravel Association (NSSGA), a position they held until 2013. Garrison has also served as director of the Indiana Mineral Aggregates Association and the Indiana Environmental Stewardship Council. Dennis is currently president of Washington Court House City Schools.

Dennis Garrison attended Wilmington College in Ohio, where they earned their bachelor's degree in economics.