Linus Torvalds

Linus Torvalds the Finnish-American software engineer (born 1969) who created the Linux kernel and started the Git version control system. His decision to release the kernel under a free software licence made it the foundation of a vast family of operating systems, and he became one of the most influential figures in the open-source software movement.

Early Life and Education

Linus Benedict Torvalds was born on 28 December 1969 in Helsinki, Finland, into a Swedish-speaking family of journalists; he was named after the chemist Linus Pauling. He received his first computer, a Commodore VIC-20, as a boy and soon moved to a Sinclair QL and then to an IBM personal computer, teaching himself programming and writing small games and utilities. He enrolled at the University of Helsinki in 1988 to study computer science.

At the university he encountered Unix systems and MINIX, a small teaching operating system written by Andrew Tanenbaum, and he became fascinated by the design of operating systems. He was, by his own account, a quiet student more interested in programming than in his coursework, and the project he began in his spare time would eventually consume his career. He completed a master's degree in 1996 with a thesis on Linux.

The Linux Kernel

In 1991 Torvalds began writing a kernel for the Intel 80386 processor, initially as a hobby to learn how the hardware worked. He announced the project in a modest message to an internet newsgroup, describing it as a free operating system and inviting others to contribute. In 1992 he chose to release it under the GNU General Public License, the copyleft licence championed by Richard Stallman, which required that derived versions remain free.

The combination of his kernel with the tools of the GNU project produced a complete free operating system, and thousands of programmers around the world joined in its development. Torvalds coordinated the work, reviewing contributions and releasing new versions, and he developed a distinctive style of distributed collaboration. The system grew from a personal experiment into a kernel used in servers, phones, embedded devices and supercomputers across the world.

Git and Collaborative Development

In 2005, when the developers of the Linux kernel lost access to the proprietary version control system they had been using, Torvalds wrote a new one. The result was Git, a distributed system in which every developer holds a complete copy of the project history. It was fast, designed to handle large projects, and it allowed branching and merging on a scale that earlier tools could not manage.

Git spread far beyond the kernel and became the dominant version control system for software development generally, powering hosting services and the workflows of countless projects. Its design reflected Torvalds's concern for performance and for the autonomy of contributors, and it proved well suited to the decentralized style of collaboration he had pioneered with Linux. It became, alongside the kernel, one of his two most consequential creations.

Leadership, Personality and Method

Torvalds has led the Linux project with a combination of technical judgement and blunt, often abrasive communication, a style that drew both loyalty and criticism. He insisted on high standards, argued vigorously on the project's mailing list, and built a hierarchical system of lieutenants to manage the growing volume of contributions. His ability to coordinate a decentralized community of volunteers became a model for large open-source efforts.

In later years he acknowledged the harm of some of his outbursts and apologized, and he took a temporary step back from leadership to reflect on the culture of the project. His approach to managing a global community, releasing frequently, delegating widely and letting technical merit decide disputes, shaped the practice of open-source governance. He became a fellow of the Linux Foundation and continued to oversee kernel releases.

Influence and Legacy

Linux became one of the most widely used operating system kernels in the world, running most web servers, most smartphones through the Android platform, and a majority of the fastest supercomputers. Torvalds was honoured with the Millennium Technology Prize in 2012 and the Turing Award in 2014, shared with the software engineer who developed the GNU tools on which the system depends. He has lived in Portland, Oregon, since the late 1990s, having taken American citizenship.

He is remembered as the creator of two pillars of modern computing and as a central figure in the rise of open-source software. By releasing his kernel for anyone to use, study and improve, he demonstrated that large and complex systems could be built by dispersed communities rather than single companies. The model he helped to establish changed how software is made around the world.

See also

• Linux kernel
• Git
• Open-source software
• GNU General Public License