Kropotkin was an aristocrat who, after being imprisoned for his insurrectionist activities, escaped and fled to England in 1876. He also drew the first good topographic maps of Siberia and wrote a memoir of his revolutionary days that has become a minor classic. More to the point, he proposed in his 1902 book, Mutual Aid: A Factor of Evolution, that the survival of animal species and much of human progress depended on the tendency to help others.
That I even know of Kropotkin comes courtesy of the Wikipedia entry for the "gift economy," the current term of art for this altruistic approach. Wikipedia is, of course, a prime example of the gift economy at work. Argue about its inaccuracies all you want, but the volunteer-authored online encyclopedia is on its way to becoming (if it isn't already) the world's dominant reference resource.