Herb Lotman, a food industry entrepreneur and founder of one of the world's largest food companies, has died at the age of 80.
Jeff Lotman said his father died Thursday at a suburban Philadelphia hospital from complications of heart failure.
Herb Lotman is the founder of Keystone Foods.
A Philadelphia native, he began his career in the food industry with his family's wholesale beef business.
In the late 1960s, Lotman and his partners pioneered cryogenics for McDonald's and developed a mass-production system for making frozen hamburgers.
Lotman built Keystone Foods over 40 years to a company generating more than $5 billion in sales annually. Keystone opened operations in over 15 countries around the world and was rated 45th on Forbes' list of America's largest private companies in 2010.