He went toe-to-toe with Muhammad Ali for 15 rounds. Ali couldn’t knock him down. Joe Frazier didn’t knock him down. George Foreman didn’t knock him down. In fact, nobody ever knocked down Canadian boxing legend, George Chuvalo. At least not in his 93 professional fights.

But he’s been knocked down like nobody outside that ring.

Chuvalo lost three sons and his wife inside 11 years to drugs, overdoses and suicide. Blows that would bring almost anyone to the canvas.

The tragedy is only one part of Boom Boom’s story. Chuvalo turned his personal trauma into a teaching opportunity. He toured high schools sharing his first-hand knowledge of the scourge of drugs. His children speak lovingly about their dad.

And this is a story of a winner, who won even when he lost. When the legendary giants can’t knock you down, you earn their respect forever.