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Today TIME pays tribute to the trailblazers, visionaries and cultural ambassadors who defined a nation: The 20 Most Influential Americans of All Time.
Pictured: Professor Albert Einstein (1879 - 1955), mathematical physicist at home in 1925.
He was the greatest mind and paramount icon of our age, the kindly, absentminded professor whose wild halo of hair, piercing eyes, engaging humanity and extraordinary brilliance made his face a symbol and his name a synonym for genius: Albert Einstein.
This list comes from the new TIME book The 100 Most Influential People of All Time, which profiles spiritual icons, leaders, explorers, visionaries and cultural titans throughout human history.