Linus Torvalds

Linus Benedict Torvalds (born 28 December 1969) is a Finnish and American software engineer who is the creator and lead developer of the Linux kernel since 1991. He also created the distributed version control system Git.

Torvalds was one of the recipients of the 2012 Millennium Technology Prize "in recognition of his creation of a new open source operating system for computers leading to the widely used Linux kernel". He is also the recipient of the 2014 IEEE Computer Society Computer Pioneer Award and the 2018 IEEE Masaru Ibuka Consumer Electronics Award.

Torvalds was born in Helsinki, Finland, on 28 December 1969, the son of journalists Anna and Nils Torvalds, the grandson of statistician Leo Törnqvist and of poet Ole Torvalds, and the great-grandson of journalist and soldier Toivo Karanko. His parents were campus radicals at the University of Helsinki in the 1960s. His family belongs to the Swedish-speaking minority in Finland. He was named after Linus Pauling, the Nobel Prize-winning American chemist, although in the book Rebel Code: Linux and the Open Source Revolution, he is quoted as saying, "I think I was named equally for Linus the Peanuts cartoon character", noting that this made him "half Nobel Prize–winning chemist and half blanket-carrying cartoon character".

His interest in computers began with a VIC-20 at the age of 11 in 1981. He started programming for it in BASIC, later writing machine code directly for the 6502 CPU (rather than using assembly language). He then purchased a Sinclair QL, which he modified extensively, especially its operating system. "Because it was so hard to get software for it in Finland", he wrote his own assembler and "(in addition to Pac-Man graphics libraries)" for the QL, and a few games. He wrote a Pac-Man clone, Cool Man.

Torvalds attended the University of Helsinki from 1988 to 1996, graduating with a master's degree in computer science from the NODES research group. His academic career was interrupted after his first year of study when he joined the Finnish Navy Nyland Brigade in the summer of 1989, selecting the 11-month officer training program to fulfill the mandatory military service of Finland. He gained the rank of second lieutenant, with the role of an artillery observer.

In 1990, Torvalds resumed his university studies, and was exposed to Unix for the first time in the form of a DEC MicroVAX running ULTRIX. Later, he bought computer science professor Andrew Tanenbaum's book Operating Systems: Design and Implementation, in which Tanenbaum describes MINIX, an educational stripped-down version of Unix.

On 5 January 1991 he purchased an Intel 80386-based IBM PC clone before receiving a copy of MINIX, which in turn enabled him to begin work on Linux.

The first Linux prototypes were publicly released on the Internet in late 1991 from an FTP server at his university. Version 1.0 was released on 14 March 1994.

Torvalds first encountered the GNU Project in the autumn of 1991 when another Swedish-speaking computer science student, Lars Wirzenius, took him to the Helsinki University of Technology to listen to free-software guru Richard Stallman's speech. Because of the talk and pressure from other contributors, Torvalds would ultimately switch his original license (which forbade commercial use) to Stallman's GNU General Public License version 2 (GPLv2) for his Linux kernel.

After a visit to Transmeta in late 1996, Torvalds accepted a position at the company in California, where he worked from February 1997 to June 2003. He then moved to the Open Source Development Labs, which has since merged with the Free Standards Group to become the Linux Foundation, under whose auspices he continues to work. In June 2004, Torvalds and his family moved to Dunthorpe, Oregon to be closer to the OSDL's headquarters in Beaverton.

From 1997 to 1999, he was involved in 86open, helping select the standard binary format for Linux and Unix. In 1999, he was named by the MIT Technology Review TR100 as one of the world's top 100 innovators under age 35.

In 1999, Red Hat and VA Linux, both leading developers of Linux-based software, presented Torvalds with stock options in gratitude for his creation. That year both companies went public and Torvalds's share value briefly shot up to about US$20 million.

Initially, Torvalds wanted to call the kernel he developed Freax (a combination of "free", "freak", and the letter X to indicate that it was a Unix-like system), but his friend Ari Lemmke, who administered the FTP server where the kernel was first hosted, named Torvalds's directory linux.

As of 2006, approximately 2% of the Linux kernel was written by Torvalds. Despite the thousands who have contributed to it, his percentage is still one of the largest. However, he said in 2012 that his own personal contribution is now mostly merging code written by others, with little programming. He retains the highest authority to decide which new code is incorporated into the standard Linux kernel.

Torvalds holds the Linux trademark and monitors its use, chiefly through the Linux Mark Institute.

On 3 April 2005, Torvalds began development on Git, version control software that later became widely used. Torvalds turned it over to Junio Hamano, who became its head maintainer in mid 2005.

Subsurface is software for logging and planning scuba dives, which Torvalds began developing in late 2011. It is free and open source software distributed under the terms of the GNU General Public License version 2. Dirk Hohndel became its head maintainer in late 2012.

Sparse is a static analysis tool that flags constructs that are likely to be of interest to kernel developers, such as the mixing of pointers to user and kernel address spaces.

Linus Torvalds is married to Tove Torvalds (née Monni), a six-time Finnish national karate champion, whom he met in late 1993. He was running introductory computer laboratory exercises for students and instructed the course attendees to send him an e-mail as a test, to which Tove responded with an e-mail asking for a date. They were later married and have three daughters, two of whom were born in the United States. The Linux kernel's reboot system call accepts their dates of birth (written in hexadecimal) as magic values.

Torvalds has described himself as "completely a-religious—atheist", adding, "I find that people seem to think religion brings morals and appreciation of nature. I actually think it detracts from both. It gives people the excuse to say, 'Oh, nature was just created,' and so the act of creation is seen to be something miraculous. I appreciate the fact that, 'Wow, it's incredible that something like this could have happened in the first place.'" He later added that while in Europe religion is mostly a personal issue, in the United States it has become very politicized. When discussing the issue of church and state separation, he said, "Yeah, it's kind of ironic that in many European countries, there is actually a kind of legal binding between the state and the state religion." In "Linus the Liberator", a story about the March LinuxWorld Conference, Torvalds says: "There are like two golden rules in life. One is 'Do unto others as you would want them to do unto you.' For some reason, people associate this with Christianity. I'm not a Christian. I'm agnostic. The other rule is 'Be proud of what you do.'"

Time magazine has recognized Torvalds multiple times:

In 2000, he was 17th in their Time 100: The Most Important People of the Century poll.

In 2004, he was named one of the most influential people in the world by Time magazine.

In 2006, the magazine's Europe edition named him one of the revolutionary heroes of the past 60 years.

InfoWorld presented him with the 2000 Award for Industry Achievement. In 2005, Torvalds appeared as one of "the best managers" in a survey by BusinessWeek. In 2006, Business 2.0 magazine named him one of "10 people who don't matter" because the growth of Linux has shrunk Torvalds's individual impact.