Dunn returned to the
United States and invested in Plaskolite, Inc., a small company that manufactured
drinking straws and
fly swatters. After his partner unexpectedly departed with Dunn's
investment capital and left the company nearly bankrupt, Dunn salvaged the business, turning it into the largest maker of
thermoplastic (
polycarbonate and
acrylic) sheeting in
North America. Dunn expanded its operations from making straws, fly swatters, and
hula hoops to manufacturing lighting panels, mirrors, and other products for retail and commercial uses. Plaskolite's products today are found among other places in automobiles, signage, lighting, windows, kitchens, bathrooms, retail displays, and eyewear. The company today produces thermoplastic products in the United States,
Mexico, and
Turkey, employing more than 1,200 people. Dunn turned the leadership of the company over to his son James in the 1980s, but remained involved in the company until its sale to a private equity firm in 2015. He continued to be active in politics and education. To honor his wartime service, in 2013 the Dunn family founded the
Donald G. and Mary A. Dunn Chair of Modern Military History at The
Ohio State University. In 2013, along with the founding of the
Donald G. and Mary A. Dunn Chair of Modern Military History, the Donald G. Dunn Scholarship Fund was founded to support
Ohio State University undergraduates and graduate students that are studying for the World War II study abroad program. == Personal life ==