Herb Lotman, founder of Keystone Foods, died on May 8 from complications of heart failure. He was 80.

Lotman, a Philadelphia native, began his career in the food industry with his family’s wholesale beef business. Lotman built Keystone Foods over 40 years to a company generating more than $5 billion in sales annually. Keystone Foods was sold to Marfrig in 2010.

In the late 1960s, Lotman and his partners pioneered cryogenics for McDonald's and developed a mass-production system for making frozen hamburgers. He was also instrumental in the development of the Chicken McNugget, the Philadephia Inquirer reported.