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In the 1940s, the world’s first computer, the ENIAC, was built by John Von Neumann, John Mauchly, J.P. Eckert and others, but in that decade what we think of as “computer science” did not really exist yet. Computer programming techniques and algorithms exploded in the 1950s, and with Turing’s publication of “Computing Machinery and Intelligence” at the beginning of the new decade, computer science quickly became synonymous with programming machines to do intelligent things.

Computer science (and soon Artificial Intelligence) grew rapidly as a field distinct from electrical engineering or pure mathematics, focused instead on building, studying, and programming computers. Computer scientists had a new tool—both practical and theoretic—and sought more powerful hardware and software in the decades that followed. Perhaps more than any other field in recent history, Computer Science transformed the modern world.

Computers in the 1950s were massive, refrigerator (or larger) sized devices that computed the results of programs input by punch cards, using at first vacuum tubes or (even worse) electromechanical switches to perform their operations. They were slow, noisy, and required massive amounts of manual preparation and work to maintain and use. New hardware was needed. Fortunately, a group of physicists led by the mercurially tempered William Shockley developed the microchip—the world’s first semiconductor (made first of germanium, then silicon as still today) computer hardware that contained all the instructions in a computer, etched into a single medium. Microchips drastically reduced the size of computers while increasing their memory and processing power.

By the 1960s, computers using microchips were using early full-featured languages (like FORTRAN or COBOL, the latter developed in part by Grace Hopper, who helped program the first computer, the ENIAC—and later EDVAC). Computers went into the noses of rockets in the Cold War, transformed business and government by facilitating rapid calculation of large numerical datasets (like census bureaus, taxes, and sales projections), and made possible the navigation of a manned vehicle to the moon.

By the 1970s, “Silicon Valley” was replete with big computer companies like Intel as well as a growing number of startups launched by entrepreneurs like Bill Gates, who saw the future of computer science not just as the use of computing machinery by large companies and government but by individuals, using what came to be called Personal Computers, or PCs. Computer science departments by the 1970s were ubiquitous in colleges and universities not just in the United States but around the world. Data structures and algorithms remained the core curriculum (the study of how information is stored and manipulated by digital computers), but the tidal wave of innovation stemming from the rise of computers in the mid to late 20th century meant that new classes appeared seemingly overnight. Computer security became an issue, as networks linked computers together with analog and digital lines, making remote break-ins and hacks a possibility (and then a real threat).

The Internet came online in the late 1960s and expanded in the 1970s to include more “hubs,” or centers where traffic could pass through, like the University of Utah. Digital networking thus became a core part of computer science. And, too, Artificial Intelligence continued its exploration of intelligent programming by successes in games—first checkers (in the 1950s), then chess (finally dominated by computers in the 1990s). In truth, AI research in Computer Science ran into many problems, but the study of computing remained a juggernaut that kept transforming how we live, work, and interact.

If the 1980s were the era of the PC, with Microsoft and Apple offering PCs with their proprietary operating systems and software (and computer scientists using either machines to do their work), the 1990s was the era of the World Wide Web. British physicist Tim Berners-Lee invented a markup language, called “HyperText Markup Language,” or HTML, and also helped develop the world’s first Web browser, with Mosaic. The Web began simply enough with Berners-Lee’s innovations, but by 1995 had become commercial, with Netscape and soon Yahoo launching commercial websites intended to capitalize on the promise of new innovations emerging from around the world in computer science. The rest, as they say, is history.

By the turn of the century, computer science was among the most powerful and popular academic subjects around the world. Students flocked to computer science departments to learn the theories and tools of a new age. And, too, by the turn of the century, the availability of massive datasets from the explosion of web pages on the World Wide Web meant that computer scientists, entrepreneurs, and indeed everyone would need strategies for storing, analyzing, and manipulating truly gargantuan quantities of digital information. This led the way to yet more innovation (and challenges) in the decades after 2000.