Madison Grant (Yale College 1887, Columbia Law School) liked to be photographed with a fedora, or just his dauntingly long head, tilted about thirty degrees to the right. He belonged, like his political ally Teddy Roosevelt, to a Manhattan aristocracy defined by bloodline and money. But Grant, like many young men of his vintage, felt duty-bound to do more than enjoy his privilege. He made himself a credible wildlife zoologist, was instrumental in creating the Bronx Zoo, and founded the first organizations dedicated to preserving American bison and the California redwoods.

Grant spent his career at the center of the same energetic conservationist circle as Roosevelt. This band of reformers did much to create the country’s national parks, forests, game refuges, and other public lands — the system of environmental stewardship and public access that has been called “America’s best idea.” They developed the conviction that a country’s treatment of its land and wildlife is a measure of its character. Now that natural selection had given way to humanity’s “complete mastery of the globe,” as Grant wrote in 1909, his generation had “the responsibility of saying what forms of life shall be preserved.”

Grant has been pushed to the margins of environmentalism’s history, however. He is often remembered for another reason: his 1916 book The Passing of the Great Race, or The Racial Basis of European History, a pseudo-scientific work of white supremacism that warns of the decline of the “Nordic” peoples. In Grant’s racial theory, Nordics were a natural aristocracy, marked by noble, generous instincts and a gift for political self-governance, who were being overtaken by the “Alpine” and “Mediterranean” populations. His work influenced the Immigration Act of 1924, which restricted immigration from Eastern and Southern Europe and Africa and banned migrants from the Middle East and Asia. Adolf Hitler wrote Grant an admiring letter, calling the book “my Bible,” which has given it permanent status on the ultra-right. Anders Breivik, the Norwegian extremist who killed sixty-nine young Labour Party members, in 2011, drew on Grant’s racial theory in his own manifesto.

Read the article “Environmentalism’s Racist History” on newyorker.com.