Mario Savio was an American civil rights and anti-war activist, best known for his role in the Free Speech Movement at the University of California, Berkeley in the 1960s. He became a prominent figure advocating for students' rights to free speech and political activism on campus, which led to significant changes in university policies. Savio's passionate speeches and leadership inspired many young people during a time of social upheaval. His famous phrase, "You can't put your feet on the ground until you get your head together," emphasized the importance of critical thinking and activism. His legacy continues to influence student movements today.