People Henry Siggins Leonard peoplepill id: henry-siggins-leonardHSL 17 views today 20 views this weekLogicianHenry Siggins LeonardBiographyListsAlso ViewedSimilar peoplePeople also viewedHenry Siggins Leonard, Jr.Ph.D. Harvard University 1958Robert S. HartmanAmerican philosopherPetre BotezatuN. I. KondakovWang FangmingChinese logicianEvgeniy Kazimirovitsj VoysjvilloRussian logicianJ.C.C. McKinseyAmerican logician and game theoristEmil Leon PostAmerican logicianJean PiagetSwiss psychologist, biologist, logician, philosopher & academicAlan TuringBritish mathematician, logician, cryptanalyst, and computer scientistJerzy SłupeckiPolish mathematical logicianAthanase JojaCharles A. BaylisAmerican philosopherFrom our partnersSponsoredHenry Siggins Leonard