
author
b. 1848
A Danish-born dairy expert and prolific practical writer, he helped shape modern cheese and milk production in the United States. His work brought together science, farming, and industry in a way that made technical subjects useful to everyday readers.

by Johan Ditlev Frederiksen
Born in Denmark in 1846, Johan Ditlev Frederiksen was educated there before building a career that connected agriculture, chemistry, and food production. He later moved to the United States, where he became closely associated with Chr. Hansen’s Laboratory in Little Falls, New York, and was remembered as a leading figure in the cheese industry.
Frederiksen wrote practical books about dairying, cheese making, and milk, including The Story of Milk. His writing reflects a hands-on, explanatory style: he was interested not just in the science of dairy products, but also in how that knowledge could improve production and quality.
He died in 1926. Although some catalogs list him as born in 1848, reliable biographical sources identify his birth date as August 18, 1846, which helps explain why his books are often linked to both dates in library records and reprints.