Leonard Nelson

Leonard Nelson
Nelson in 1922
Born11 July 1882
Died29 October 1927 (aged 45)
Spouse
Elisabeth Schemmann
(m. 1907; div. 1912)
PartnerMinna Specht (since 1915)
Education
EducationFranzösisches Gymnasium Berlin
Heidelberg University
Humboldt University of Berlin
University of Göttingen (PhD, 1904; Dr. phil. hab., 1909)
ThesisJakob Friedrich Fries und seine jüngsten Kritiker (1904)
Doctoral advisorJulius Baumann
Philosophical work
Era20th-century philosophy
RegionWestern philosophy
SchoolNeo-Kantianism (Neo-Friesian)
InstitutionsUniversity of Göttingen
Notable studentsPaul Bernays, Gustav Heckmann, Gerhard Weisser, Fritz Eberhard, Alfred Kubel, Willi Eichler
Main interestsCritical philosophy, philosophy of science, logic
Notable ideasGrelling–Nelson paradox, revival of the Socratic method

Leonard Nelson (/ˈnɛlsən/; German: [ˈnɛlzɔn]; 11 July 1882 – 29 October 1927), sometimes spelt Leonhard, was a German mathematician, critical philosopher, and socialist. He was part of the neo-Friesian school (named after post-Kantian philosopher Jakob Friedrich Fries) of neo-Kantianism and a friend of the mathematician David Hilbert. He devised the Grelling–Nelson paradox in 1908 and the related idea of autological words with Kurt Grelling.

Nelson subsequently became influential in both philosophy and mathematics, as his close contacts with scientists and mathematicians influenced their ideas. Despite dying earlier than many of his friends and assistants, his ISK organization lived on after his death, even after being banned by the Nazi Regime in 1933. It is even claimed that Albert Einstein supported it. He's also credited with popularizing the Socratic method in his book Die sokratische Methode (The Socratic Method).