Mr. Twardzik's son Tom told the Times his father died Nov. 10 in Pottsville.
The company, which started with five women working in Mary Twardzik's kitchen in 1952, now employs 240 people and produces more than a dozen variety of pierogis, including feta and spinach and jalapeno and cheddar.
A 1945 graduate of Mahanoy Township High School. Mr. Twardzik served in the Army and graduated with a business degree from Notre Dame University in 1951.
After a short stint as an accountant at Arthur Anderson, he returned home to start Mrs. T's.
In 2000, Mr. Twardzik co-founded Lee's Oriental Gourmet Foods, the Times said.