Boxing legend Muhammad Ali is celebrating his 70th birthday today.
Time is commemorating the occasion by displaying a collection of Ali through the years. Sports Illustrated's Director of Photography writes, "There was a time when no one was more photographed than Muhammad Ali. The pictures from the 60s and early 70s helped define sports in America." And the iconic images displayed by Time prove that assertion.
Although Ali doesn't have an official Twitter profile, that hasn't stopped fans, celebrities and sport figures from sending him birthday wishes. ESPN has paid tribute to Ali tweeting, "'I am the greatest, I said that even before I knew I was.' Happy Birthday Muhammad Ali." LeVar Burton also tweeted about Ali, saying "Happy Birthday Muhammad Ali... You are and always will be The Greatest!!! #bydhttmwfi."
You can find out more about Muhammad Ali, and view some of the iconic photos of him through the years, here.