About Lou Groen
Lived 1917 – 2011 (aged 93). Lou Groen was an American businessperson and mcDonald's.
Louis M. Groen (August 8, 1917 – May 30, 2011) was an American entrepreneur, businessman, and lifelong resident of Cincinnati, Ohio. Groen invented the Filet-O-Fish sandwich in 1962. He invented the sandwich at his struggling McDonald's restaurant to satisfy his customers. At the time, most of his customers were Roman Catholic, and abstained from eating meat on Fridays. The Filet-O-Fish, served with cheese and tartar sauce, is now served at McDonald's restaurants throughout the world.
Biography Early life and career Born and raised in Cincinnati, Ohio, Groen graduated from North College Hill High School in 1935. At his peak, Groen owned 43 McDonald's restaurants in the Ohio and northern Kentucky region, eventually selling them back to the McDonald's corporation, including a longtime business partner Ed Cummings's brother and son. He held on to two, in Northgate and Tylersville, until his own son Paul took them over in 1994.
Career with McDonald's
A prominent McDonald's hamburger restaurant franchisee from 1959 to 1986, after he introduced his sandwich in 1962, McDonald's Corp. founder and CEO Ray Kroc was not exactly thrilled at the idea of a fish sandwich on his franchise menu, for he thought that he had a better idea, a "Hula" burger, which had simply a breaded, fried pineapple slice in between a toasted bun and a slice of cheese. Recalls Groen: "I told Ray (Kroc) about it (the idea of the Filet-O-Fish sandwich) and he said, “You’re always coming up here with a bunch of crap!” “I don’t want my stores stunk up with the smell of fish.” Groen engaged in a wager with Kroc on whose idea would sell better. Groen recalls again: "I called in (to McDonald's) and asked, "How many sandwiches did (Kroc) sell?" They (McDonald's) said "I can't tell you.” They asked “How many did you sell?" I said "350!" Then, they said "It's on the menu!"
Death Groen died peacefully of natural causes on May 30, 2011, in Cincinnati.
Don’t just read it —
keep it.
Full-length biographies made to live with: read them, listen on the way to work, watch them tonight.
- E-book
- Audio
- Video
Instant download · yours to keep · every purchase keeps this site free
Important facts
People in Lou Groen's life
Named in this biography and alive at the same time
Contemporaries
People whose lives overlapped Lou Groen's
Frequently asked questions
Who was Lou Groen?
American businessman (1917-2011)
When was Lou Groen born?
Lou Groen was born on 8 August 1917 in Cincinnati.
When did Lou Groen die?
Lou Groen died on 30 May 2011 in Cincinnati, Ohio, Ohio.
What was Lou Groen's occupation?
Lou Groen was a businessperson and mcDonald's.
What nationality was Lou Groen?
Lou Groen was American.
Sources & further reading
Cite this page
APA: Biography.guide. (2026). Lou Groen. https://biography.guide/lou-groen/
MLA: "Lou Groen." Biography.guide, https://biography.guide/lou-groen/.
Chicago: "Lou Groen." Biography.guide. https://biography.guide/lou-groen/.
Data last updated: 2026-09-22 · Spot an error? Report a correction.
Page generated 2026-09-27 05:01 UTC