Person: Stallings, John Robert
John Stallings was an American mathematician who worked in geometric group theory and 3manifold topology.
Mathematical Profile (Excerpt):
 After graduating with his first degree, Stallings went to Princeton University where he undertook research supervised by Ralph Fox.
 Without any idea how Smale had achieved this, Stallings was brave enough to try to prove the conjecture himself.
 After returning from Oxford, Stallings taught at Princeton, first as an instructor in mathematics and later as assistant professor, before being appointed as a professor at the University of California at Berkeley in 1967.
 In 1968 Stallings published his most famous paper On torsionfree groups with infinitely many ends in the Annals of Mathematics.
 For this truly outstanding paper the American Mathematical Society awarded Stallings their Frank Nelson Cole Prize in Algebra in 1970.
 The first of these introduced the 'Stallings subgroup graph' as a method to describe subgroups of free groups.
 It also introduced a foldings technique now known as 'Stallings' foldings method' which has been the basis for much later work.
 Stallings retired from his chair at Berkeley in 1994 but he continued to supervise doctoral students until 2005.
 The special issue of volume 92 of Geometriae Dedicata dedicated to Stallings was another honour to mark his sixtyfifth birthday.
 His ideas often inspired a great flurry of activity by other mathematicians, though, who would follow up and develop Stallings' methods.
 Everyone loved Stallings.
 Stallings had a dislike of authority, and made a point of playing by his own rules.
 Stallings once wrote an entire paper in Interlingua, a universal language created in the mid20th century to facilitate world communication.
 Interlingua was only one of the obscure languages Stallings studied, according to cousin Sylvia Shannon of Virginia.
Born 22 July 1935, Morrilton, Arkansas, USA. Died 24 November 2008, Berkeley, California, USA.
View full biography at MacTutor
Tags relevant for this person:
Group Theory, Origin Usa, Topology
Thank you to the contributors under CC BYSA 4.0!
 Github:

 nonGithub:
 @JJO'Connor
 @EFRobertson
References
Adapted from other CC BYSA 4.0 Sources:
 Oâ€™Connor, John J; Robertson, Edmund F: MacTutor History of Mathematics Archive