Dennis Ritchie: The Quiet Genius Behind C, Unix, and Your Phone

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In October 2011, days after the world mourned Steve Jobs, Dennis Ritchie was found dead at 70 in his home in Berkeley Heights, New Jersey, where he lived alone. The news first spread through a short online post by former colleague Rob Pike. Few outside computing noticed, yet the iPhones and MacBooks that made Jobs famous ran on foundations Ritchie built: the C programming language and the Unix operating system he created with Ken Thompson at Bell Labs.

This episode follows Ritchie from Bronxville, New York, where he was born on September 9, 1941, to Harvard degrees in physics and applied mathematics and a doctoral dissertation he finished but never filed. At Bell Labs he and Thompson abandoned the bloated Multics project, salvaged a discarded PDP-7, and built something lean. To free Unix from one machine, Ritchie reworked Thompson's B language into C, a bridge between hardware control and readable code.

• Ritchie drafted his Harvard dissertation by 1968 but never received the PhD. The document was thought lost until the Computer History Museum recovered a copy in 2020.
• Brian Kernighan suggested the name Unix in 1970 as a pun on Multics, and in 1978 he and Ritchie published The C Programming Language, known as the K and R book.
• In the 1970s Ritchie, James Reeds, and Robert Morris broke the M-209 cipher machine using ciphertext alone. After consulting the National Security Agency, they chose not to publish.
• He stayed at Bell Labs for his whole career, worked on Plan 9, Inferno, and the Limbo language, and retired in 2007 as head of system software research at Lucent Technologies.
• He and Thompson won the Turing Award in 1983 and the National Medal of Technology in 1998. After his death, Fedora 16 and FreeBSD 9.0 were dedicated to him, and an asteroid carries his name.