 Walter Lewin, professor of physics (1936-)
Walter Lewin is an astrophysicistand a teacher with a flair for showmanship. Hislegendary undergraduate lectures at MITwere broadcasted by UWTV (Seattle) and were online in video form,through MIT'sOpenCourseWare. In March 2017, Quora blocked /unblocked him. So, he left.
 Neil J.A. Sloane, AMS Fellow (1939-)
Neil James Alexander Sloane created a huge encyclopedia (oeis.org) of noteworthy integersequences. Each sequence is uniquely identified by a 6-digit A-number (e.g.,A000055) known far and wide as a Sloane number.
 Leonard Susskind, top physicist (1940-)
One of the founders of string theory (he coined the term worldsheet). Professor of theoretical physics atStanfordsince 1979. His ongoing series of videos on Modern Physics (Stanford Continuing Studies) have been available online since 2008.
 Ron Kurtus, engineer (1940-)
Ron Kurtus is an engineer who spent a few years in the entertainment industrybefore returning to electro-optical engineering. He has established a strong online presence focusing on Science education,mostly at the high-school level.
 Carl R. "Rod" Nave,professor of physics
Department of Physics & Astronomy, Georgia State University. The quaint style ofHyperPhysicscomes from the HyperCard ® system(Apple Computer) for which it was originally designed.
 Edmund F. Robertson (1943-)
Edmund Robertson is one of the two editors (withJohn O'Connor)of the authoritative MacTutor History of Mathematics archive. He is a Professor emeritus of pure mathematics at theUniversity of St Andrews.
 Russell J. Rowlett, metrologist (1944-)
He was director of the Center for Mathematics and Science Educationof the University of North Carolina at Chapel Hill (which was closed due to budget cuts,on 2010-06-30). Rowlett advocates hisown systemfor naminglarge numbersby combiningmetricandGreek (chemical) prefixes.
 Jim Clark, chemistry teacher (1944-)
ACambridgegraduate who spent over 30 yearsteaching A-level chemistry (to 16-18 year old students). In 1997, he retired fromTruro School (Cornwall) to concentrate on writing and promoting a true understanding of chemistry.
 Robert Lawrence Kuhn (1944-)
Robert Kuhn holds a BS in biology (Johns Hopkins, 1964) a doctorate in brain research (UCLA, 1968) and a mid-career MBA (MIT Sloan, 1980). Kuhn is a financial advisor and political commentator with ties to China. He has hosted and produced the PBS series Closer to Truth since 2000.
 John J. O'Connor (1945-)
J.J. O'Connor is one of the two editors (withE.F. Robertson)of the authoritative MacTutor History of Mathematics archive,which is the most popular online part of the Mathematical MacTutor "stack" (running on Apple'sHyperCard system).
 Peter J. Cameron, mathematician (1947-)
Born in Australia. Emeritus professor of mathematics atQueen Mary, University of London (QMUL). Currently (2014) Prof. Cameron is also working part-time as professor of mathematics at the University of Saint-Andrews, Scotland (School of Mathematics & Statistics).
 Edward L. "Ned" Wright, cosmologist (1947-)
Astronomy Professor at UCLA (Los Angeles).
 Alexander Bogomolny (1948-2018)
Professor emeritus of mathematics at the University of Iowa. Until May 2004, Bogomolny had amonthly columnon the site of the Mathematical Association of America.
 Umberto Cerruti, algebraist (1948-)
Department of Mathematics, University of Torino (Italy).
 David W. Cantrell, mathematician (1949-)
Known for his presence on mathematical newsgroups,where he answers popular questions and offers original contributions, David Cantrell also contributes toMathWorld,Numericana, etc.
 Suzanne Alejandre, math teacher
Suzanne Alejandre was EducationalResource & Service Developer at The Math Forum @ Drexel. She has been providing online lesson plans conformingto the NCTM Standards (National Council of Teachers of Mathematics).
 Jeff Miller, educator (c.1952-)
Mathematics teacher (1994-2017) at Gulf High School in New Port Richey (Florida) where he's been living since 1980. Named teacher of the year in 2005 and 2013. Jeff Miller created an authoritative page about the"Earliest Known Uses of Some of the Words of Mathematics".
 Sten F. Odenwald, astronomer (1952-)
Born in Karlskoga, Sweden, Sten Odenwald received his Ph.D. in astronomy from Harvard in 1982. Author of several books, he is currently affiliated with NASA'sGSFC and theCatholic University of America. Diagnosed with cancer in 2008, he is now in remission and optimistic!
 David Darling, science writer (1953-)
David Darling earned his Ph.D. in Astronomy fromManchesterin 1977 underZdenek Kopaland worked forCray Research... A full-time writer since 1982, Darling has lived in both the USand the UK. He has been running his websites since 1999.
 Mike de Villiers, educator (c.1956-)
A former high-school teacher (HDEin 1978, "Best Science Teacher" in 1983,DEd in 1990) who went on to teach mathematics education. Former editor of,author of 7 books and over 150 papers. Vice-chair of the since 1997.
 Chris K. Caldwell, number theorist (1956-)
Professor in the Department of Mathematics and Statistics,at UT Martin.
 Simon Plouffe, numerologist (1956-)
He collaborated toSloane'sEncyclopedia of Integer Sequences.Plouffe is best known for his Inverter, which looks for symbolicexpressions of decimal numbers (that allowed me to identify the transfinite sum of the harmonic series as Log 2 in a matter of seconds, on 2018-07-12).
 David J. Rusin (1957-)
A former associate professor of mathematics atNIU (1986-2010) he's moved to theUniversity of Texas. Dave Rusin launched a website in 1996 to sharemathematical tidbits he had collected since 1990, using the Mathematics Subject Classification (MSC).
 Robin Whitty, theorem collector (1960-)
Whitty received his Ph.D. in 1984from London South BankUniversity, where he has served as a visiting professor. Inspired by MacTutor's Mathematicianof the Day, Robin Whitty started Theorem of the Day in 2005, aiming for366 theorems.
 Christoph Schiller (1960-)
Christoph Schiller is a citizen of the world who was raised in Italy, studied physicsin Germany and obtained a Belgian Ph.D. in physics. He has made available for free download (pdf) a nicely craftedphysics textbook of about 1500 pages.
 Karl Dahlke, blind scientist (1960-)
Dahlke has been totally blind since age 10. He once managed towrite a speech synthesizer on his Apple II using the bell as sole feedback. Histext-basedmathematical site is so good that it can be extremely useful to sighted people.
 Kathy Joseph
 John Baez, mathematical physicist (1961-)
ProfessoratUC Riverside, interested inCategory theory. The folk singerJoan Baez (b.1941-01-09) is his cousin. John C. Baez was a one-man army who answeredmanyphysics questions onsci.physics.research. The aperiodic column he started in 1993 would inspire the blog format.
 David A. Eppstein, computer scientist (1963-)
Professor in the School of Information and Computer Science,at UC Irvine.
 Ed Pegg, Jr., Math recreationist (1963-)
As a mathematician with a strong interest in recreational mathematics, Ed Pegg Jr. may well be the heir apparent to Martin Gardner 1914-2010) in the Internet era. He helped Stephen Wolfram withNKS andjoined MathWorld in 2004.
 Cynthia Lanius, teacher & activist
Cynthia Lanius isvocalabout the underrepresentation of women in mathematics and computing. She isAssociatedirector for The Math Forum @ Drexel,but continues to maintain her own k-12 math site, hosted at Rice University.
 Robert Munafo, programmer (1964-)
An amateur mathematician whose interests include integer sequences,large numbers and fractals (especially theMandelbrot set) Munafo maintains an authoritative site on triviaabout specific numbers. He has contributed toSloane's OEIS.
 Glenn A. Elert, physics teacher (1964-)
Glenn Elert teaches atMidwood High School at Brooklyn College (NY). He acts as the editor of the Physics Factbook, a large collection ofessays written by high-school students as an exercise in library research methods (in a scientific context).
 Don Lincoln, particle physicist (1964-)
Don got his Ph.D. from Rice in 1994. He helped discover the top quark at Fermilab in 1995and the Higgs Boson at the LHC in 2012. He is a noted popularizer of high-energy physics. Since2011, Don has been producing and hosting great outreach videos for Fermilab (see somesamples).
 Arvin Ash (c. 1965-)
He claims to hold a BS in chemical engineering, an MS in mechanical engineering, and an MBA. He also says he attended medical school for 2 years. He doesn't specify where or when. All the videos I have seen from him (since 2018) are top notch and I'm happy to leave it at that.
 Burkard Polster, mathematician (1965-)
He started his Mathologer videos in 2015, with the helpof Giuseppe Gerachitano. He has authored many books, some withfellowmathematician Marty Ross (author of the blog Bad Mathematics, mathematicalcrap.com). Since 2004, the pair has maintaineda joint website, entitled Maths Masters.
 Dan Piponi, computer graphics guru (1966-)
Thinker, tinkerer and Academy Award winner... Signing sigfpe, Dan Piponi maintains the blog A Neighborhood of Infinity (great name!) which features some superb essays aboutquantum physics and other mathematical topics.
 Dr. Kevin S. Brown (Kent, WA)
Kevin Brown signs his name onlyoncein his MathPages website (which doesn't have any external links). Before 1999, he was discussingRelativity and other mathematical topics on . He's related toFred Olden,notAnatoly.
 Chris Hillman, general relativist
Chris startedRelWWWas a graduate student atUW in 1992. He left his pages in the care ofJohn Baez before returning inMarch 2007,disappointed by hisWikipedia experience. Sadly, Hillman lost faith again in June 2007 but remainsactive online.
Colin Hughes, British TeacherIn October 2001, Colin Hughes started Project Euler (as a section ofMathsChallenge.net) where readers are posed mathematical questions which can beanswered by designing a computer program that can run in "less than a minute".
 Eric W. Weisstein, encyclopedist (1969-)
Weisstein holds a BA in Physics fromCornell (1990) anddegrees in Planetary Astronomy fromCaltech (MS in 1993 and Ph.D. in 1996). He created MathWorld, a major online encyclopedia which was threatened, in 2000, by aninfamous lawsuit fromCRC,publisher of a book based on it.
 Daniel Chan, professor of mathematics (1971-)
Born in Hong-Kong. As he was a late developer, his parents rushed emigration to Australia (1974) so he couldstart school later (1975). After a juniorpost at Michigan(2000-2002) Chan joined the faculty of UNSW Sidney where he was named head of pure mathematics in 2016.
 Matt O'Dowd, astrophysicist (1973-)
Matt O'Dowd was a LehmanCollege astrophysics professor when he was recruited as host for the very popularPBS Web Series Space Time in August 2015 to replace Gabe Perez-Giz, (who moved to theNSF in Washington). Graeme Gossel writes some of the scripts for that channel.
  Terence Tao, mathematician (1975-)
Born in Australia, Terence Chi-Shen Tao is a professor of mathematics atUCLA (he was granted full professorship at age 24). Terry Tao received the Fields Medal in 2006 (seePAP) and waselected a Fellow of the Royal Society (2007).
 Frederic P. Schuller (1975-)
Associate professor of applied mathematic at the University of Twente since 2019. He is known for the clarity of his old-school lectures on mathematical topicsrelated to mathematical physics.
![University of Nottingham]()  Brady Haran, Australian video journalist
Brady started the Periodic Table of Videos(PTOV) in 2008 as an unscripted series of interviews with Martyn Poliakoff. Thisgrewinto several series about Science (more recently, religion and philosophy) featuring an endearing bunch of faculty members at theUniversity of Nottingham.
Sal Khan (1976-)Salman Khan
 Alom Shaha, filmmaker
Born in Bangladesh, raised in London, UK (where he works). Alom Shaha is a physics teacher, film-maker,science writer and TV producer. His approach to science communication was rewarded by a fellowship of the National Endowment for Science Technology and the Arts.
 Anton Petrov (c.1978-)
Former high-school science teacher who toys with Universe Sandbox and puts out a constant stream of videos about papers in astrophysicsand the latest space-related news.
 Hank Green (1980-)
Hank started the VlogBrothers channel in 2007 with his brother John (b. 1977). Hank's portfolio grew to includes SciShow,SciShow Kids,SciShow Space,SciShow Psych,CrashCourse... Also hosts PBS Eons (PBS Digital Studios, 2017-06-22) with Kallie Moore and Blake de Pastino.
 CGP Grey (1980-)
Colin Gregory Palmer Grey. Podcasts: Hello, Internet (HI) withBrady Haran and Cortex with Myke Hurley.
 James Grime (1980-)
Born and raised inNottingham. Msci fromLancaster and Ph.D. fromYork (2007,underMaxim Nazarov). Now apublic speaker based at Cambridge's Institute of Continuing Education,he is best known as a regular onBrady Haran's Numberphile. Grime also runs theSingingBanana channel.
 Matt Parker, mathematics educator (1980-)
Parker is a former teacher of high-school mathematics from Australia. Since 2014, he has been married to science communicatorLucie Green.
 Destin Sandlin, engineer (1981-)
Having posted educational videos since 2007, he launched Smarter Every Day on2011-04-24 (retroactively including his first million-view video, posted on2008-06-15).
 Vitalii Vanovschi, software engineer (c.1982-)
Vitalii Vanovschi created The Number Empire in 2006. He is a computer scientist with a strong interest in chemistry. In 2009, he obtained his Ph.D from the University of Southern California and became a software engineer atGoogle.
 Derek Muller, physics educator (1982-)
Muller created3 YouTube channels: Veritasium (Jan. 2011), 2veritasium (Jul. 2012), andSciencium (Feb. 2017). Muller holds a Ph.D. in science education. He is concerned with the way misconceptions arise and are communicated, in physics and elsewhere: E.g., Illusion of Truth, Post-Truth.
 Joe Hanson, biologist (1983-)
First appeared on TV in The Beauty and the Geek (2005). Hanson got his Ph.D. in cell and molecular biology from the University of Texas at Austin(2006-2013). In 2013, he created the YouTube channel It's Okay To Be Smart (PBS Digital Studios) which he has been hosting ever since.
 Michael Stevens (1986-)
What matters more? Being right or fitting in? Stevens launched the VSauce YouTube channel on June 24, 2010. It has now more than 12 million subscribers and 1.2 billion views. Four successful spinoffs are hosted by Stevens himself, Kevin Lieber or Jake Roper.
 James J. Orgill, engineer (c.1987-)
Orgill obtained his Ph.D. in chemical engineeringfrom Brigham Young University (BYU) in 2014. He started his YouTube channel The Action Lab in May of 2016.
 Peyam R. Tabrizian, mathematician (1987-)
Born in Iran, he grew up in Vienna (Lycée Français de Vienne)and graduated from Lycée Français de New-York. He got his Ph.D. fromUC Berkeley (May 2016) and spent a postdoc year inWilliams Collegebefore joining the faculty ofUCI. He started his YouTube channel in August 2017.
Victoria Hart is the talented child of MoMath co-founderGeorge W. Hart (1955-) himself noted for his "Virtual Polyhedra" page (online encyclopedia ofpolyhedra, 1996). Vi Hart achieved viral fame with stop-motion animations on math themes. She once called herself gender agnostic.
 Henry Reich, physicist (1988-)
Creator of the MinutePhysics videos (June 2011). Reich illustrates with stick figures pithy comments which arescientifically accurate. Holding an MS in Physics (his thesis is onGR) he became a digitalartist in residence at the Perimeter Institute.
 Brian James McManus, Irish engineer (c. 1988-)
He holds a BS in biomedical engineering from NUI Galway (2011) and an MSin aeronautical engineering from Limerick (2013). In 2016, inspired byDestin Sandlin, Brian started producing videos full-time about engineering topics. He foundedJunto Media in 2017 (1-4 employees).
Alec Watson (c. 1988)Based in Chicago.
ElJj, Jérôme CottenceauProfesseur agrégé de mathématiques (Lycée Léonard de Vinci, Montaigu-Vendée)
 Dianna Cowern, physicist (1989-)
She created the Physics Girl channel in 2011. Dianna Cowern has enrolled a team of half-a-dozen part-time people,including writers Sophia Chen and Jade Tan-Holmes who went on to create her ownsuccessful channel in 2016. (Science Magazine,2017-03-16.) Health update
Alex MeyerAlex once owned thetrademark Tech Ingredients and has used it since 2013 with thestellar host he once called Grandpa Tech and who may be his own father.
 Cory Arnold, musicologist (1989-)
Autistic musician with a degreein vocal performance. His main occupation is the YouTube channel 12tone, consisting of fast-paced presentations of music theory voiced overthe accelerated drawing (right-to-left, on blank music sheets) of a limited number of doodles loosely related to the topics.
 Trefor Bazett, mathematician
As a graduate student inToronto, Bazett was recognizedfor teachingexcellence in 2015. After a first position atthe University of Cincinatti, Bazett became an assistant teaching professor at UVic, in June 2019. His father, Desmond W. Bazett (1952-) is an architect in Victoria, BC.
 Rebecca J. Smethurst, astrophysicist (c.1990-)
Becky Smethurst competed in the 2014 UK final FameLab, where she took second place but was Audience Winner. She obtained her Ph.D. in astrophysics from Oxford in 2017.
  Grant Sanderson (c.1991-)
Graduated from Stanford in 2015. Q&A, 2018 (10:20).
 Kelsey Houston-Edwards, mathematician
A native of San Diego, she's currently aPh.D. Student atCornell (BA 2013, MS 2016). In September 2016, Kelsey created the YouTube channel PBS Infinite Series, hosting it until Nov. 2017 (it closed in May 2018). She was named AMS-AAAS Mass-Media Fellow atNOVA Next in 2016.
 Angela Collier, Ph.D. (c. 1991-)
A first-generation graduate student who shares her views of American Academia. She also describes some dysfunctions in the research community.
 Jade Tan-Holmes, Australian physicist (1992-)
She says 3 years of applied physics(BS)taught her she was terrible at experiments. She got interested in making physics and math videos on YouTube andstarted out as a writer for Physics Girl (2012) where she played herself once (2018). Jade launched her own channel Up and Atom in April 2016.
 Toby Hendy, physicist (1995-)
Former Ph.D. student at the Australian National University, On 2019-02-08, she presented her reasons for quitting. Her Tibees channel focuses on the academic experience: From topics and sample exams to school reports and doctoral dissertations of famous scientists.
Trevor Kai Hai Cheung, statistician
Science YouTubersBrainSTEM meeting of 2012, informally covered inVeritassium and Sixty Symbols.
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