What do Earl Warren and John Muir have in common?

It is rather hard to compare these two men, simply because of their completely different areas of expertise. However, I believe that they do have one strong unifying theme; the improvement of our country through their activist viewpoints. Earl Warren helped us strongly determine our acceptance of other cultural backgrounds, as well as develop fair opportunities for those who should need them in certain situations. John Muir was a huge factor in our National Park system and conversations which we treasure as Americans. In completely different ways, these two have made an enormous impact in our society that still stands strongly to this day, and assisted in shaping our American beliefs.