Alfred North Whitehead

Alfred North Whitehead spent his first decades as an English mathematician, collaborating with his former student Bertrand Russell on the three-volume Principia Mathematica between 1910 and 1913 - a work that landed among the twentieth century's most important in mathematical logic and ranked 23rd on Modern Library's top 100 nonfiction list. By the late 1910s he pivoted to philosophy of science, then to metaphysics, where he built a comprehensive system that broke from most of Western thought. He argued that reality consists not of independent material objects but of processes defined by their relations with other processes - a framework laid out in Process and Reality, now the cornerstone of process philosophy. The implications ran wide: his ideas have been applied across ecology, theology, physics, biology, economics, and psychology. In the twenty-first century his thought found traction in ecological ethics, where the case for seeing the world as an interconnected web carries new weight.