Born Cassius Marcellus Clay Jr., Muhammad Ali earned his nickname as “The Greatest” over his long career as an American Olympic and professional boxer. As colorful a sports figure as the world has ever seen, Ali always spoke his mind and was known as an inspiring, controversial and polarizing figure both inside and outside the ring. Ali remains the only three-time lineal world heavyweight champion, winning the title in 1964, 1974 and 1978. But his greatest gift to the world was probably his work fighting parkinson’s and raising awareness for the disease. He really showed the world what it was like to battle the disease, and live with grace. May he rest in peace.