Gernatt married
Flavia C. Schmitz in 1938, and they began Dan Gernatt Dairy Farms in 1938. In the 1950s, the couple was identified as having the largest milking dairy herd in
Erie County. As the Gernatts' farming business expanded, it was later simply known as
Dan Gernatt Farms. In the 1960s, the Gernatt's transitioned their dairy farming business to one of breeding and racing
Standardbred horses. The Gernatts established themselves in horse breeding and harness racing throughout a period of three decades. The horse business raised and sold more than 1,000 horses. The corporate businesses include Dan Gernatt Gravel Products, Inc.; Gernatt Asphalt Products, Inc.; and Country Side Sand and Gravel, Inc., with headquarters at Taylor Hollow Road in
Collins, New York. Other businesses are in
Gowanda,
Freedom,
Irving,
Great Valley,
Springville,
Chaffee,
West Seneca,
Delevan,
South Dayton, and
Westfield, all in the
New York State counties of
Erie,
Cattaraugus, and
Chautauqua. The companies were cofounded in 1946 by Gernatt and his late wife,
Flavia C. (Schmitz) Gernatt. The companies also own and operate the public Gowanda Airport. The companies are also involved in oil and natural gas exploration, maintain a real estate division, and are copartners in an electric cogeneration plant. ==Philanthropy==