| David Deutsch | David Elieser Deutsch FRS is a British physicist at the University of Oxford. He is a Visiting Professor in the Department of Atomic and Laser Physics at the Centre for Quantum Computation in the Clarendon Laboratory of the University of Oxford. | Website, http://www.daviddeutsch.org.uk/h | Twitter, https://twitter.com/DavidDeutschOxf |
| Karl Popper † | Karl Raimund Popper was an Austrian-British philosopher and professor. He is generally regarded as one of the 20th century's greatest philosophers of science. | Website, https://en.wikipedia.org/wiki/Karl_Popper | |
| Brett Hall | Brett Hall is based in Australia and the creator of ToKCast, a podcast largely about the work of David Deutsch. | Website, https://www.bretthall.org/ | Twitter, https://twitter.com/tokteacher/ |
| Sarah Fitz-Claridge | Sarah Fitz-Claridge is a writer, editor, and speaker with interests in philosophy, psychology, self-development, freedom, and other topics related to living a fulfilling life. She founded Taking Children Seriously in the 1990s and is currently writing a book on the subject. | Website, https://www.fitz-claridge.com/ | Twitter, https://twitter.com/FitzClaridge |
| Peter Medawar † | Peter Brian Medawar FRS was a British immunologist and Nobel laureate. He was a professor at the University of Oxford and a Fellow of All Souls College, Oxford. | Website, https://en.wikipedia.org/wiki/Peter_Medawar | |
| Naval Ravikant | Naval Ravikant is an Indian-American entrepreneur, investor, and author. He is the co-founder and CEO of AngelList and Spearhead | Website, https://nav.al/ | Twitter, https://twitter.com/naval |
| Aaron Stupple | Aaron Stupple is the founder of Conjecture Magazine which applies Critical Rationalism to contemporary issues and the nature of progress. Aaron is an internal medicine physician in Massachusetts. | | Twitter, https://twitter.com/astupple |
| Logan Chipkin | Logan Chipkin is a writer based in Philadelphia. His previous publications can be found on his website. He is also working on a fiction novel, chapters of which can be found on his Substack. | Website, http://www.loganchipkin.com/ | Twitter, https://twitter.com/ChipkinLogan |
| Dennis Hackethal | Dennis Hackethal is a philosopher and software engineer. His book A Window on Intelligence is aimed at the general reader and covers artificial general intelligence, the evolution of people, AI safety, and more. | Website, https://blog.dennishackethal.com/ | Twitter, https://twitter.com/dchackethal |
| Arjun Khemani | Arjun Khemani is an unconventional high school student who writes about progress, philosophy, science, and optimism and is the host of the Arjun Khemani Podcast. | Website, https://arjunkhemani.com | Twitter, https://twitter.com/arjunkhemani |
| J. C. Lester | J. C. Lester is a philosopher and author of Escape From Leviathan and other books. | Website, https://philpeople.org/profiles/jan-clifford-lester | Twitter, https://twitter.com/JCLester |
| Ella Hoeppner | Ella Hoeppner is a software engineer with an interest in epistemology, artificial general intelligence, and artificial life. She writes at FourStrands.org and on her website. | Website, https://www.ellahoeppner.com/ | Twitter, https://twitter.com/ella_hoeppner |
| Bruce Nielson | Bruce Nielson runs FourStrands.org and hosts the Theory of Anything podcast. Both explore subjects related to David Deutsch's 'Four Strands'. | Website, https://fourstrands.org/ | Twitter, https://twitter.com/bnielson01 |
| Lulie Tanett | Lulie Tanett is a writer from Oxford, England, specializing in applied Critical Rationalism. She writes about all things epistemology — from education and memetics to productivity and motivation, to how coercion affects rationality, progress and happiness.' | Website, https://reasonisfun.com/ | Twitter, https://twitter.com/reasonisfun |
| Christofer Lövgren | Christofer Lövgren is running the Do Explain podcast. | | Twitter, https://twitter.com/ReachChristofer |
| Ben Chugg | Ben is a computer scientist at Stanford Law School, mostly working on sequential decision-making problems. He has done work in optimization, complexity theory, graph theory, and machine learning and is co-host of the Increments podcast. | Website, https://www.incrementspodcast.com/ | Twitter, https://twitter.com/BennyChugg |
| Vaden Masrani | Vaden is a Ph.D. student at the University of British Columbia where he focuses on machine learning, probabilistic programming, bayesian inference and other topics. He's also the co-host of the Increments podcast. | Website, https://vmasrani.github.io/ | Twitter, https://twitter.com/VadenMasrani |
| Stuart Firestein | Stuart Firestein is a professor of biology at Columbia University. He is the author of Failure: Why Science Is So Successful. | Website, http://stuartfirestein.com/ | |
| Aniket Vartak | Aniket is a Machine Learning researcher, worked at Deep Learning Qualcomm and is currently Chief Scientist at care.ai | Website, http://www.aniketvartak.com/ | Twitter, https://twitter.com/aniketvartak |
| Daniel C. Elton | Daniel C. Elton, Ph. D. worked as a Staff Scientist at the National Institutes of Health and is currently a Data Scientist at Mass General Brigham. | Website, https://moreisdifferent.substack.com/ | Twitter, https://twitter.com/moreisdifferent |
| Ray Scott Percival | Ray Scott Percival holds a Ph.D. from the London School of Economics and founded and edited The Karl Popper Web. | Website, https://www.youtube.com/c/rayscottpercival | Twitter, https://twitter.com/ray_s_percival |
| Cam Peters | Cam Peters writes at falliblepieces.substack.com. | Website, https://falliblepieces.substack.com/ | Twitter, https://twitter.com/campeters4 |
| Oliver Scott Curry | Research Director at kindness.org, Affiliate at Oxford Anthropology, Associate at LSE Philosophy | Website, https://oliverscottcurry.com/ | Twitter, https://twitter.com/oliverscottcurry |
| Bart Vanderhaegen | Bart Vanderhaegen runs Fallible management a podcast and consultancy on how to accelerate knowledge growth in organisations. | Website, www.anchor.fm/falliblemanagement | Twitter, https://twitter.com/B_Vanderhaegen |
| Jesse Nichols | Jesse Nichols is a software engineer and worked at Roam Research, Replit and Marble. He writes at infinitedays.org. | Website, https://infinitedays.org/ | Twitter, https://twitter.com/JesseNichols |
| Chris Best | Chris Best is the co-founder and CEO of Substack, a platform that enables writers to publish newsletters and get paid for their work. | Website, https://cb.substack.com/ | Twitter, https://twitter.com/cbest |
| Moritz Wallawitsch | Moritz Wallawitsch is working on RemNote.com, a knowledge management platform. He writes and podcasts about cognitive augmentation, startups and epistemology at scalingknowledge.substack.com. He also created this website. | Website, https://scalingknowledge.substack.com/ | Twitter, https://twitter.com/moritzw42 |