Well-known for his work in the numerical sub-fields of low-dimensional topology and geometric group theory, this School of California-Berkeley professor demonstrated the Poincaré Conjecture and devised the Stallings Theorem on the subject of Ends of Groupings. After getting his undergraduate level in the School of Arkansas, he received his mathematics doctorate from Princeton School. He was the 1970 receiver of the American Mathematical Society’s Frank Nelson Cole Award in Algebra. He was created and elevated in Morrilton, Arkansas, and he afterwards lived and proved helpful in Berkeley, California. He and fellow American mathematician David Gale had been contemporaries.