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Photo credits

The 183 thinker portraits come from Wikimedia Commons, under public-domain or Creative Commons licences. They are cropped to a circle and shown in black and white. Each links to its original file.

• al-FarabiMr.Nostalgic · Public domain · Source
• Kristin AndrewsInstitut des sciences cognitives - UQAM · CC BY 3.0 · Source
• Thomas AquinasCarlo Crivelli · Public domain · Source
• St. Thomas AquinasCarlo Crivelli · Public domain · Source
• Blaise Agüera y ArcasCmichel67 · CC BY-SA 4.0 · Source
• AristotleAfter Lysippos · Public domain · Source
• David Malet ArmstrongDamato · CC BY-SA 3.0 · Source
• Sri AurobindoRudolf 1922 · Public domain · Source
• AvicennaNational Library of Medicine · No restrictions · Source
• Joscha BachJoi Ito from Cambridge, MA, USA · CC BY 2.0 · Source
• Edmond BauerBenjamin Couprie · Public domain · Source
• Henri BergsonHenri Manuel · Public domain · Source
• George BerkeleyJohn Smibert · Public domain · Source
• Thomas BerryCaroline Webb, http://caroline-webb.com/ · CC BY 3.0 · Source
• BhartṛhariUnknown artist · Public domain · Source
• Susan BlackmoreStagiaireMGIMO · CC BY-SA 4.0 · Source
• Madame BlavatskyUnsure · Public domain · Source
• Ned BlockNed Block · GFDL · Source
• Lenore BlumGeorge Bergman · CC BY-SA 4.0 · Source
• Avrim BlumRweba · CC BY-SA 3.0 · Source
• David BohmUnknown photographer · Attribution · Source
• Nick BostromFuture of Humanity Institute · CC BY 4.0 · Source
• Francis Herbert BradleyPessimistic Idealism · CC BY-SA 4.0 · Source
• Franz BrentanoUnknown authorUnknown author · Public domain · Source
• C. D. BroadPaul Arthur Schilpp. · Public domain · Source
• Andrew E. BudsonAndrew Budson · CC BY-SA 4.0 · Source
• Mario BungeProf. Mario Bunge · CC BY-SA 3.0 · Source
• William H. CalvinBob Lee · CC BY 2.0 · Source
• Robin Carhart-HarrisThomas Angus, Imperial College London · CC BY-SA 4.0 · Source
• Bernard CarrMystic Meg · CC BY-SA 3.0 · Source
• Carlton CavesCMCaves · CC BY-SA 4.0 · Source
• David ChalmersDannyGolcman · CC BY-SA 4.0 · Source
• Pierre Teilhard de ChardinPhillippe Halsman · CC BY-SA 3.0 · Source
• Noam ChomskyΣ, retouched by Wugapodes and Jonnmann · CC BY-SA 4.0 · Source
• Deepak ChopraGage Skidmore · CC BY-SA 3.0 · Source
• Patricia ChurchlandVera de Kok · CC BY-SA 4.0 · Source
• Andy ClarkUnknown authorUnknown author · CC BY 4.0 · Source
• William Lane CraigReasonableFaith.org · CC BY 3.0 · Source
• Francis CrickFrancis_Crick.png: Photo: Marc Lieberman, per ticket:2015100910022707 derivative work: Materialscientist (talk) · CC BY 2.5 · Source
• Antonio DamasioFronteiras do Pensamento · CC BY-SA 2.0 · Source
• Hanna DamasioAntónio Pedro Ferreira · CC BY-SA 4.0 · Source
• Paul DaviesChristopher Michel · CC BY-SA 4.0 · Source
• Terrence DeaconKk · GFDL · Source
• Stanislas DehaenePer Henning/NTNU · CC BY 2.0 · Source
• Ilia DelioLisa Drover OSF · CC BY-SA 4.0 · Source
• Daniel DennettDmitry Rozhkov · CC BY-SA 3.0 · Source
• Jacques DerridaAuto-épreuve · CC BY 4.0 · Source
• René DescartesAfter Frans Hals · Public domain · Source
• Fred DretskeFred I. Dretske · CC BY-SA 3.0 · Source
• David EaglemanChristopher Michel · CC BY-SA 4.0 · Source
• Gerald EdelmanBernard Gotfryd · Public domain · Source
• George EllisDavid Monniaux · CC BY-SA 3.0 · Source
• George F.R. EllisDavid Monniaux · CC BY-SA 3.0 · Source
• Federico FagginIntel Free Press · CC BY-SA 2.0 · Source
• Edward FeserEdward Feser · CC0 · Source
• Paul FeyerabendGrazia Borrini-Feyerabend · Attribution · Source
• Johann Gottlieb FichtePublic domain · Source
• Owen FlanaganGabriella Clare Marino · CC BY-SA 4.0 · Source
• Jerry Alan Fodoren:User:Pealco · Public domain · Source
• Sigmund FreudMax Halberstadt · Public domain · Source
• Karl FristonWIRED · © WIRED, all rights reserved
• Christopher A. FuchsDutchAgent · CC BY-SA 4.0 · Source
• Markus GabrielBüro Markus Gabriel · CC BY-SA 4.0 · Source
• Shaun GallagherMicahg · Public domain · Source
• Rodolfo GambiniPullin · Public domain · Source
• GauḍapādaAshok Prabhu · CC BY-SA 3.0 · Source
• Jean GebserUnknown authorUnknown author · CC BY-SA 4.0 · Source
• Amanda GefterHarvard STS program · CC BY 2.0 · Source
• Peter Godfrey-SmithDanimations · CC BY-SA 4.0 · Source
• Philip GoffArt Uncut · CC BY-SA 4.0 · Source
• Rebecca Newberger Goldsteinsame · CC BY-SA 3.0 · Source
• Ravi GomatamYudem · CC0 · Source
• David Ray GriffinVanished user lolalsdkj4ijesis22 · Public domain · Source
• Stephen GrossbergStephen Grossberg · CC BY-SA 4.0 · Source
• Peter HackerProf4321 · CC BY-SA 4.0 · Source
• Stuart HameroffZereshk · CC BY 3.0 · Source
• Graham HarmanDoctorWolffel · CC0 · Source
• Gilbert HarmanUnknown authorUnknown author · Public domain · Source
• Sam HarrisCmichel67 (Christopher Michel) · CC BY-SA 4.0 · Source
• David Bentley HartJjhake · CC BY-SA 4.0 · Source
• Georg Wilhelm Friedrich HegelJakob Schlesinger · Public domain · Source
• Martin HeideggerWilly Pragher · CC BY 4.0 · Source
• Michel HenryPhotographie prise au début des années 1990 par sa femme Anne Henry · CC0 · Source
• Thomas HobbesJohn Michael Wright · Public domain · Source
• J. Allan HobsonMetonyme · CC BY-SA 4.0 · Source
• Erik HoelDotori1001 · CC BY-SA 4.0 · Source
• Douglas Hofstadter"null0" · CC BY-SA 2.0 · Source
• David HumeAllan Ramsay · Public domain · Source
• Nicholas HumphreyLittleHow · CC BY-SA 3.0 · Source
• Edmund HusserlUnknown (Mondadori Publishers) · Public domain · Source
• Aldous Huxleysinaloaarchivohistorico · No restrictions · Source
• Peter van InwagenHeller jonas · CC BY-SA 4.0 · Source
• Ray JackendoffThe original uploader was Mitchoyoshitaka at English Wikipedia. · CC BY 3.0 · Source
• Frank JacksonPashute · CC BY-SA 4.0 · Source
• William JamesNotman Studios (photographer) · Public domain · Source
• Brian JosephsonBrian Josephson · CC BY 3.0 · Source
• Carl JungUnbekannt · PDM-owner · Source
• Menas KafatosDreas1892 · CC BY-SA 3.0 · Source
• Subhash KakKirstenRichards · CC BY-SA 4.0 · Source
• Immanuel KantJohann Gottlieb Becker (1720-1782) · Public domain · Source
• KapilaUnknown authorUnknown author · Public domain · Source
• Bernardo KastrupRebel Wisdom · CC BY 3.0 · Source
• Stuart KauffmanTeemu Rajala · CC BY 3.0 · Source
• Christof KochZereshk · CC BY 3.0 · Source
• Saul KripkeOursipan · Public domain · Source
• Jiddu KrishnamurtiUnknown authorUnknown author · Public domain · Source
• George LakoffMikethelinguist · CC BY-SA 4.0 · Source
• Gottfried Wilhelm LeibnizChristoph Bernhard Francke · Public domain · Source
• Rodolfo LlinasRodolfo Llinas · Public domain · Source
• John LockeGodfrey Kneller · Public domain · Source
• Fritz LondonGFHund · CC BY 3.0 · Source
• Bhagavan Sri Ramana MaharshiG. G. Welling · Public domain · Source
• Ramana MaharshiG. G. Welling · Public domain · Source
• Nicolas MalebrancheRijksmuseum · CC0 · Source
• Humberto MaturanaRodrigo Fernández · CC BY-SA 4.0 · Source
• Iain McGilchristRebel Wisdom · CC BY 3.0 · Source
• Swami MedhanandaEllis408 · CC0 · Source
• Alexius MeinongUnknown authorUnknown author · Public domain · Source
• Maurice Merleau-Pontyhttp://www.philosophical-investigations.org/Users/PerigGouanvic · CC BY 3.0 · Source
• Thomas MetzingerJumpilo · CC BY-SA 4.0 · Source
• Earl K. MillerNeocx · CC BY-SA 4.0 · Source
• Marvin MinskyThe original uploader was Sethwoodworth at English Wikipedia. · CC BY 3.0 · Source
• J.P. MorelandJ.P. Moreland · CC BY-SA 3.0 · Source
• Tony NaderThechaseuk · CC BY-SA 4.0 · Source
• NāgārjunaUnknown | Recovered from Himalayan Art Resources · Public domain · Source
• Thomas NagelNagelt · CC BY-SA 4.0 · Source
• Seyyed Hossein NasrTariqabjotu at English Wikipedia · CC BY 3.0 · Source
• John von NeumannLANL · Attribution · Source
• Hartmut NevenQuantum Computing Guy · CC BY-SA 4.0 · Source
• Alva Noëjwalsh from Seattle · CC BY 2.0 · Source
• Jaak PankseppAndres Tennus / Tartu Ülikool · CC BY-SA 3.0 · Source
• Sam Parnianewsonline · CC BY 2.0 · Source
• Wolfgang PauliNobel foundation · Public domain · Source
• Charles Sanders PeirceCharles_Sanders_Peirce_theb3558.jpg: NOAA Office of NOAA Corps Operations derivative work: Ori.livneh (talk) · Public domain · Source
• Roger PenroseCirone-Musi, Festival della Scienza · CC BY-SA 2.0 · Source
• Steven PinkerChristopher Michel · CC BY-SA 4.0 · Source
• PlatoMarie-Lan Nguyen · Public domain · Source
• John PolkinghorneJack1956 · CC BY-SA 3.0 · Source
• Karl PopperFranz Barta · No restrictions · Source
• Hilary PutnamUnknown authorUnknown author · CC BY-SA 2.5 · Source
• Willard Van Orman QuineMaryclaire Quine · CC BY 4.0 · Source
• V.S. RamachandranDavid Shankbone · CC BY 3.0 · Source
• Eleanor RoschUnknown Author · CC0 · Source
• Carlo RovelliFronteiras do Pensamento · CC BY-SA 2.0 · Source
• Bertrand RussellBassano Ltd · Public domain · Source
• ŚaṅkaraRaja Ravi Varma · Public domain · Source
• Prabhat Ranjan SarkarAnanda Marga Pracaraka Samgha · CC BY-SA 3.0 · Source
• Jean-Paul SartreUnknown authorUnknown author · CC BY-SA 3.0 nl · Source
• Swami SarvapriyanandaSubhobrata Chakravorti · CC BY-SA 4.0 · Source
• Friedrich Wilhelm Joseph SchellingJoseph Karl Stieler · Public domain · Source
• Susan SchneiderWikiUser5628 · CC BY-SA 4.0 · Source
• Jonathan SchoolerDan Dascalescu · CC BY-SA 4.0 · Source
• Arthur SchopenhauerJohann Schäfer · Public domain · Source
• John SearleFranksValli · CC BY-SA 4.0 · Source
• Wilfrid SellarsS. Edgerton · Public domain · Source
• Anil SethCarlos Figueroa Rojas · CC BY-SA 4.0 · Source
• Rupert SheldrakeZereshk · CC BY 3.0 · Source
• Michael ShermerDavid Patton · CC BY 3.0 · Source
• Lee SmolinLumidek at English Wikipedia · CC BY-SA 3.0 · Source
• Mark SolmsNews UCT · CC BY 4.0 · Source
• Roger SperryUnknown authorUnknown author · Public domain · Source
• Baruch Spinozaanonymous · Public domain · Source
• Rupert SpiraAwareness · CC BY 3.0 · Source
• Ian StevensonUnknown authorUnknown author · Public domain · Source
• Maria StrømmeNTNU – Norwegian University of Science and Technology · CC BY-SA 2.0 · Source
• Eleonore StumpStumpep · CC BY 4.0 · Source
• Richard SwinburneZiel · CC BY-SA 3.0 · Source
• Raymond TallisHamze.hashemi · CC BY-SA 4.0 · Source
• Charles TartJudy Tart · CC BY-SA 4.0 · Source
• Max TegmarkWeb Summit · CC BY 4.0 · Source
• Giulio TononiNIH · Public domain · Source
• Alan TuringElliott & Fry · Public domain · Source
• Umāsvātiजैन · CC BY-SA 4.0 · Source
• Francisco VarelaCC BY 2.0 · Source
• VasubandhuShouyi 首一 · Public domain · Source
• Swami VivekanandaThe original uploader was Dziewa at English Wikipedia. · Public domain · Source
• Keith WardPortland Seminary from Portland, OR, USA · CC BY-SA 2.0 · Source
• Alfred North Whiteheadunknown · Public domain · Source
• Eugene WignerNobel foundation · Public domain · Source
• Ludwig WittgensteinMoritz Nähr · Public domain · Source
• Stephen WolframStephen Wolfram's PR team/Stephen Faust · CC BY-SA 3.0 · Source
• Hamza YusufUnknown authorUnknown author · CC0 · Source
• Dan ZahaviThomas Szanto · CC BY-SA 4.0 · Source