| Jules Schwartz | — | Dead | programming languages | JOVIAL |
| Charles Babbage | 1791–1871 | Dead | computing | — |
| Ada LovelaceAugusta Ada King, Countess of Lovelace | 1815–1852 | Dead | computing | — |
| George Boole | 1815–1864 | Dead | theory | — |
| Herman Hollerith | 1860–1929 | Dead | Data processing | Tabulating Machine Company |
| Thomas J. Watson Sr. | 1874–1956 | Dead | Business | — |
| Vannevar Bush | 1890–1974 | Dead | Engineering | As We May Think |
| Norbert Wiener | 1894–1964 | Dead | theory | — |
| Emil Post | 1897–1954 | Dead | theory | — |
| Haskell Curry | 1900–1982 | Dead | theory | — |
| Howard Aiken | 1900–1973 | Dead | computing | — |
| Alonzo Church | 1903–1995 | Dead | theory | An Unsolvable Problem of Elementary Number Theory |
| John von NeumannNeumann János | 1903–1957 | Dead | theory | IAS Machine |
| Tommy Flowers | 1905–1998 | Dead | Hardware | Colossus |
| Grace HopperAmazing Grace | 1906–1992 | Dead | programming languages | A-0 System FLOW-MATIC COBOL |
| Kurt Gödel | 1906–1978 | Dead | theory | — |
| John Mauchly | 1907–1980 | Dead | computing | ENIAC Eckert–Mauchly Computer Corporation Short Code UNIVAC I |
| Stephen Cole Kleene | 1909–1994 | Dead | theory | — |
| Konrad Zuse | 1910–1995 | Dead | computing | Zuse Z1 Zuse KG Zuse Z3 Plankalkül |
| Frederic Calland Williams | 1911–1977 | Dead | Hardware | Manchester Baby Manchester Mark 1 |
| Alan Turing | 1912–1954 | Dead | theory | On Computable Numbers Pilot ACE |
| Maurice Wilkes | 1913–2010 | Dead | computing | EDSAC |
| J. C. R. LickliderRobert Licklider | 1915–1990 | Dead | networking | Man-Computer Symbiosis |
| Adriaan van Wijngaarden | 1916–1987 | Dead | programming languages | ALGOL 68 |
| Christopher Strachey | 1916–1975 | Dead | programming languages | CPL Fundamental Concepts in Programming Languages |
| Claude Shannon | 1916–2001 | Dead | theory | A Mathematical Theory of Communication |
| Herbert Simon | 1916–2001 | Dead | Artificial intelligence | The Logic Theory Machine |
| J. Presper Eckert | 1919–1995 | Dead | computing | ENIAC Eckert–Mauchly Computer Corporation UNIVAC I |
| Bob Bemer | 1920–2004 | Dead | computing | COMTRAN |
| Kenneth E. Iverson | 1920–2004 | Dead | programming languages | APL J |
| Tom Kilburn | 1921–2001 | Dead | Hardware | Manchester Baby Manchester Mark 1 |
| Alan Perlis | 1922–1990 | Dead | programming languages | — |
| J. C. ShawCliff Shaw | 1922–1991 | Dead | programming languages | JOSS |
| Edgar F. Codd | 1923–2003 | Dead | databases | A Relational Model of Data for Large Shared Data Banks |
| Joseph Weizenbaum | 1923–2008 | Dead | ai | — |
| Charles Bachman | 1924–2017 | Dead | databases | — |
| Donald Davies | 1924–2000 | Dead | networking | — |
| John Backus | 1924–2007 | Dead | programming languages | FORTRAN ALGOL 60 FP Can Programming Be Liberated from the von Neumann Style? |
| Alick Glennie | 1925–2003 | Dead | programming languages | Autocode |
| Douglas Engelbart | 1925–2013 | Dead | computing | Augmenting Human Intellect: A Conceptual Framework |
| John Cocke | 1925–2002 | Dead | computing | — |
| Seymour Cray | 1925–1996 | Dead | Hardware | CDC 6600 Cray Research Cray-1 |
| Tony BrookerRalph Anthony Brooker | 1925–2019 | Dead | programming languages | — |
| Fernando CorbatóCorby | 1926–2019 | Dead | operating systems | CTSS Multics |
| John G. Kemeny | 1926–1992 | Dead | programming languages | Dartmouth BASIC |
| Ken Olsen | 1926–2011 | Dead | Hardware | Digital Equipment Corporation |
| Kristen Nygaard | 1926–2002 | Dead | programming languages | Simula |
| Paul Baran | 1926–2011 | Dead | networking | — |
| Allen Newell | 1927–1992 | Dead | Artificial intelligence | The Logic Theory Machine |
| David Wheeler | 1927–2004 | Dead | programming languages | — |
| John McCarthy | 1927–2011 | Dead | programming languages | LISP Recursive Functions of Symbolic Expressions |
| Marvin Minsky | 1927–2016 | Dead | ai | — |
| Robert Noyce | 1927–1990 | Dead | Semiconductors | Fairchild Semiconductor Intel |
| Wally Feurzeig | 1927–2013 | Dead | programming languages | Logo |
| Wes Clark | 1927–2016 | Dead | computing | — |
| Jean Sammet | 1928–2017 | Dead | programming languages | — |
| Peter Naur | 1928–2016 | Dead | programming languages | — |
| Seymour Papert | 1928–2016 | Dead | programming languages | Logo |
| Thomas E. Kurtz | 1928–2024 | Dead | programming languages | Dartmouth BASIC |
| Winston W. Royce | 1929–1995 | Dead | theory | — |
| Edsger W. Dijkstra | 1930–2002 | Dead | theory | Go To Statement Considered Harmful |
| Peter Landin | 1930–2009 | Dead | Programming languages | The Next 700 Programming Languages |
| Fred Brooks | 1931–2022 | Dead | operating systems | No Silver Bullet |
| Ole-Johan Dahl | 1931–2001 | Dead | programming languages | Simula |
| Frances Allen | 1932–2020 | Dead | programming languages | — |
| Gordon Bell | 1934–2024 | Dead | Hardware | — |
| Niklaus Wirth | 1934–2024 | Dead | programming languages | ALGOL W Pascal Modula Modula-2 Oberon |
| Ralph Griswold | 1934–2006 | Dead | programming languages | SNOBOL Icon |
| Robin Milner | 1934–2010 | Dead | programming languages | ML Standard ML |
| Robert W. Floyd | 1936–2001 | Dead | theory | — |
| Larry Roberts | 1937–2018 | Dead | networking | — |
| Per Brinch Hansen | 1938–2007 | Dead | programming languages | — |
| Charles GeschkeChuck Geschke | 1939–2021 | Dead | programming languages | PostScript |
| William Wulf | 1939–2023 | Dead | programming languages | BLISS |
| Jean Ichbiah | 1940–2007 | Dead | programming languages | Ada |
| John Warnock | 1940–2023 | Dead | programming languages | Adobe Systems PostScript |
| Alain Colmerauer | 1941–2017 | Dead | programming languages | Prolog |
| Dennis Ritchie | 1941–2011 | Dead | programming languages | B C The UNIX Time-Sharing System The Development of the C Language |
| Ray Tomlinson | 1941–2016 | Dead | networking | — |
| Gary Kildall | 1942–1994 | Dead | operating systems | Digital Research CP/M |
| Chuck Thacker | 1943–2017 | Dead | computing | — |
| Jon Postel | 1943–1998 | Dead | networking | RFC 791: Internet Protocol |
| Brad Cox | 1944–2021 | Dead | programming languages | Objective-C |
| Jim Gray | 1944–2012 | Dead | databases | — |
| Larry Tesler | 1945–2020 | Dead | computing | — |
| Gilles Kahn | 1946–2006 | Dead | theory | — |
| ArvindArvind Mithal | 1947–2024 | Dead | theory | — |
| Ray Boyce | 1947–1974 | Dead | databases | SQL |
| Joe Armstrong | 1950–2019 | Dead | programming languages | Erlang |
| Bill Atkinson | 1951–2025 | Dead | operating systems | HyperTalk |
| Paul Allen | 1953–2018 | Dead | Business | Microsoft |
| Phil Moorby | 1953–2022 | Dead | programming languages | Verilog |
| Roger Hui | 1953–2021 | Dead | programming languages | J |
| Steve Jobs | 1955–2011 | Dead | operating systems | Apple Computer NeXT |
| Terry A. Davis | 1969–2018 | Dead | operating systems | HolyC TempleOS |