1964: As a contemplative four-year-old… 1964: At home with furry friend… 1965: The dawn of reason… 1966: Sampling the ancient world… 1967(?): Selfie! 1967: “He is full of spirit & determination…” 1969: First publication… 1969: Following the moon landing… 1971: Just turning twelve… 1972: Turning thirteen and saying what he knows about particle physics… 1973: Starting to program… 1974: A treatise on particle physics… 1975: Publishing a physics paper… 1976: In Eton regalia… 1976: Particle physics calculations… or life before Mathematica…

1976: Science with pen plotter… 1977: A first adventure in cosmology… 1977: Card-carrying physicist… 1978: As teenage particle physicist… 1978: Almost the inflationary universe… 1978: Computer algebra as secret weapon… 1979: Becoming a professor… 1979: A very short paper, just for once… 1979: Figuring out where the top quark can be… 1980: Seeing the quarks (and gluons)… 1981: A little media adventure… 1981: Mathematica’s immediate ancestor… 1981: Beginning to write about “complex structures” (with a word processor)… 1982: How much energy is there in an empty box? 1982: Numerical computation in the service of quantum field theory…

1981: Finding out what cellular automata do… 1982: In the midst of big discoveries… 1982: Cellular automata make fractals… 1983: The first cellular automaton paper… 1983: Virtual taxonomy: discovery of the four classes of cellular automata… 1984: Yes, the shell looks like the cellular automaton on the screen… 1984: Cellular automata on a Sun-2 upstairs from Einstein’s old office… 1984: Cellular automata on a Sun-2 upstairs from Einstein’s old office… The Wolfram Classes appear in print… Part of the class 4 zoo… 1984: Cellular automata grace the cover of Nature magazine… 1984: What a mess! The two-step finite automation for rule 18… 1984: Some new science slips into Scientific American… 1985: Cellular automata in two dimensions… 1985: Short, sweet and rarely understood…

1984: Rule 30 in all its glory… 1984: Feynman tries to prove that Wolfram is wrong… 1984: The business of cellular automata: commemorative postcards… 1984: “You should study complexity” 1985: A friend’s advice (mostly) not taken… 1985: Trying the patent system on cellular automata… 1985: Applying cellular automata to fluid flow… 1986: A first collection of cellular automaton papers… 1986: The state of cellular automata in 1986… 1986: Starting a journal… 1987: Summarizing complex systems just before leaving the field… 1987: Pretty good technology prediction…

1987: It all starts with C code… 1987: Mathematica is alive! Programs in Mathematica before it was Mathematica… 1987: Omega, Polymath, Technique… and finally… Mathematica… 1988: Mathematica is bundled on every NeXT computer… 1988: The first Mathematica poster… June 23, 1988: Mathematica arrives… June 23, 1988: Mathematica Version 1… June 23, 1988: The Mathematica Book is published… June 24, 1988: The day after: Mathematica is a hit… 1989: A brief bearded phase… 1989: 30th-birthday gift from the company… 1989: Apple and Albert promote Mathematica… 1990: The first Mathematica Conference…

1989: Speaking like a CEO 1990: The Mathematica Journal is launched… 1991: Getting ready for Mathematica 2… 1991: Posing for the release of Mathematica 2… 1991: Mathematica 2 is released… 1992: Mathematica wins awards of all shapes and sizes… 1992: Mathematica expands around the world… 1993: Posing with staff on Mathematica’s fifth anniversary… 1995: In a rare corporate pose… 1995: Lots and lots of Mathematica books… 1996: Mathematica 3 is released… 1996: Making a point in an interview… 1996: On the road to promote Mathematica 3… 1998: Posing with staff on Mathematica’s 10th anniversary… 1998: Mathematica is ten years old… 1999: Mathematica 4 is released…

1992: Collecting data for A New Kind of Science… 1992–2000: How the cover of NKS came to be… 1994: Hard at work on A New Kind of Science… 1994: Collecting the seeds for the new science… 1995: It was going to be a publicity shot for A New Kind of Science—but years too early… 1996: Photographing for the NKS book 1996: A CEO’s work is never done… 1997: Cellular automata as inspirational office art… 1997: Cellular automata as inspirational office art… 1997: Shells for science… 1998: Pushing the envelope of printing technology… 1999: Rule 30 fills a page of a broadsheet newspaper… 2000: It took 6000 books to make A New Kind of Science… 2002: Posing for the dust jacket: a little tired, but satisfied to have finished writing NKS…

2002: Ugh! A perfectionist’s job is never done: a PostScript bug revealed in the direct-to-plate printing process of page 157 of NKS… 2002: Precision printing is still a craft: a pile of NKS signatures hot off the press… 2002: NKS is finally printed… 2002: Signing NKSes for friends and employees… 2002: Just like software engineering: the final nightly build of NKS… 2002: Every NKS is unique… 2002: The NKS story breaks… 2002: A New Kind of Science as a poster: all the same words, but rather small… 2002: NKS is #1 on Amazon… 2002: NKS hits Main Street… 2002: The NKS media rush begins… May 14, 2002: www.wolframscience.com

2002–2003: NKS goes on tour (to 50 cities)… 2002: “Award-winning” means you have to pick up the awards… 2002: The personal server room grows 2003: The first NKS Summer School… 2003: The first NKS Conference… 2003: Mathematica 5 arrives… 2004: NKS as art: at the Cooper-Hewitt Museum (New York)… 2004: The NKS book goes online… Citations to the NKS book grow… 2005: WolframTones is launched… 2007: Favorite cellular automata from five years of Summer School students… 2007: You never know where you’ll see an NKS book 2007: A bounty is put—and claimed—on the simplest universal Turing machine

2006: The concept of Wolfram|Alpha begins to build… 2007: Creating the very first Demonstration for the Wolfram Demonstrations Project 2007: Beginning to blog… May 1, 2007: A revolution in Mathematica… 2008: Mathematica is growing exponentially… 2009: The first glimmers of Wolfram|Alpha… 2009: Anticipation builds for Wolfram|Alpha 2009: Wolfram|Alpha: Testing, testing… 2009: Ready to push the button to launch Wolfram|Alpha 2009: We launched! 2009: August 29, 1959, 5:55pm GMT—the minute of turning 50 2009: Wolfram|Alpha goes mobile 2009: People like Wolfram|Alpha…

2010: Announcing a 4th project at TED 2012: Personal analytics from Facebook 2012: The next generation does a code+flying demo… 2012: Analyzing personal analytics… 2012: National Museum of Mathematics… 2012: First Wolfram High-School Summer Camp 2012–2016: Traveling the world… 2013: Trying to be Wolfram|Alpha… but 300 years too early… 2015: Pi Day of the Century… with Wolfie… 2015: Hollywood, aliens, graphics… 2015: What is spacetime, really? 2016: Lives and ideas of some notable people… 2017– : Livestreamed CEOing 2000s: Making discoveries live and in public… 2017: Rule 30 business cards 2017: A train station covered in rule 30… 2017: A New Kind of Science on the web—now in high resolution 2017: Eclipse! 2017: Researching scientific history in the field… 2019: Revealing some personal productivity schemes… 2019: Collector of gadgets, useful and not 2019: A New Kind of Science makes it to the Moon… 2019: Testifying at the US Senate… 2019: Repeating a photo from 52 years earlier… 2019: Walkabout: a record number of steps… 2019: Putting prizes on all-time favorite rule 30 2019: Collecting some of my computational adventures… 2020: A lot of live CEOing 2020: A big surprise: perhaps a path to the fundamental theory of physics… 2020: The combinators 100-year celebration event

2011: Fitting into a timeline of systematic data 2013: Wolfram Language makes its debut (at SXSW) 2014: Wolfram Language is so succinct it’s tweetable 2015: Neural nets work! 2015: Mathematica turns 27 2015: Steadily building the technology stack… 2015: Wolfram Language: an elementary book… 2016: Roadside Wolfram Language… 2018: Mathematica is 30!