Bill Gates
Co-founder of Microsoft and philanthropist
William Henry Gates III was born on October 28, 1955, in Seattle, Washington. He is an American businessman and philanthropist who helped spark the microcomputer revolution in the 1970s and 1980s. In 1975, he and his childhood friend Paul Allen co-founded the software company Microsoft. After Microsoft went public in 1986 and its stock price climbed, Gates became the youngest billionaire in the world at that time in 1987, when he was 31. Between 1995 and 2017, *Forbes* listed him as the wealthiest person on its World’s Billionaires list for 18 out of those 24 years, including 13 consecutive years from 1995 to 2007. In 1999, his net worth briefly topped $100 billion, making him the first person to reach that milestone. As of July 2026, *Forbes* estimated his net worth at $106.5 billion, ranking him as the 19th-richest person globally.
Gates grew up in Seattle and attended the private Lakeside School, where he met Allen and first got into computing. He enrolled at Harvard University in 1973, taking advanced math and graduate-level computer science courses, but dropped out in 1975 to start and lead Microsoft. He served as the company’s CEO for 25 years, and when Microsoft was incorporated in 1981, he also became its president and chairman of the board. In 2000, Steve Ballmer took over as CEO, and Gates shifted to the role of chief software architect, which he held until 2008. He stepped down as chairman in 2014, then became a technology adviser to CEO Satya Nadella and other Microsoft leaders, a position he still holds. He left the board entirely in 2020.
Over time, Gates focused more on philanthropy through the Bill & Melinda Gates Foundation, the largest private charitable organization in the world. He and his then-wife, Melinda French Gates, co-chaired the foundation from 2000 until 2024. Their work targets health, education, and poverty, with a particular emphasis on fighting diseases like tuberculosis, malaria, and polio. After French Gates resigned as co-chair following their divorce, the foundation was renamed the Gates Foundation, and Gates became its sole chair.
Gates also founded and chairs several other companies, including BEN, Cascade Investment, TerraPower, Gates Ventures, and Breakthrough Energy. In 2010, he and Warren Buffett started the Giving Pledge, a commitment by billionaires to donate at least half their wealth to charity. *Time* magazine named him one of the 100 most influential people of the 20th century in 1999. He has received many other honors, including the Presidential Medal of Freedom, awarded jointly to him and French Gates in 2016 for their philanthropic work. Several documentary films have covered his life, and in 2025 he published the first of three planned memoirs, *Source Code: My Beginnings*.
**Early life and education**
William Henry Gates III was born on October 28, 1955, in Seattle, Washington, the only son of Bill Gates Sr. (1925–2020) and his first wife, Mary Maxwell Gates (1929–1994). His ancestry includes English, German, and Irish/Scots-Irish roots. His father was a prominent lawyer, and his mother served on the boards of First Interstate BancSystem and United Way of America. His maternal grandfather, J. W. Maxwell, was a national bank president. Gates has an older sister, Kristi (Kristianne), and a younger sister, Libby. He is the fourth of his name in the family but goes by William Gates III or “Trey” (meaning three) because his father used the “II” suffix. The family lived in Seattle’s Sand Point area, where a rare tornado damaged their home when Gates was seven.
As a child, his parents hoped he would become a lawyer. The family regularly attended a Congregational Christian church, a Protestant Reformed denomination. Gates was small for his age and was bullied. His family encouraged competition; one visitor noted that whether it was hearts, pickleball, or swimming to the dock, there was always a reward for winning and a penalty for losing.
At age 13, Gates enrolled at Lakeside Prep School. In eighth grade, the school’s Mothers’ Club used proceeds from a rummage sale to buy a Teletype Model 33 ASR terminal and computer time on a General Electric system for students. Gates became interested in programming the GE system in BASIC and was excused from math classes to pursue it. He wrote his first computer program on that machine—a tic-tac-toe game that let users play against the computer. He was fascinated by how the machine always executed software code perfectly.
When the Mothers’ Club funds ran out, Gates and other students sought time on other systems, including DEC PDP minicomputers. One such system was a PDP-10 owned by Computer Center Corporation (CCC). CCC banned Gates, Paul Allen, Ric Weiland, and Gates’s best friend and first business partner, Kent Evans, for the summer after catching them exploiting bugs in the operating system to get free computer time. The four students then formed the Lakeside Programmers Club to earn money. After the ban ended, they offered to find bugs in CCC’s software in exchange for more computer time. Instead of using the system remotely, Gates went to CCC’s offices and studied source code for programs like Fortran, Lisp, and machine language. This arrangement lasted until 1970, when CCC went out of business.
In 1971, a Lakeside teacher asked Gates and Evans to automate the school’s class-scheduling system, offering them computer time and royalties. The two worked hard to complete the project.
- born
- October 28, 1955
- field
- Business, Philanthropy
- nationality
- American
- known_for
- Co-founding Microsoft, philanthropy with the Gates Foundation
Lore & Background
Born and raised in Seattle, Washington, Gates was privately educated at Lakeside School, where he befriended Allen and developed his computing interests. In 1973, he enrolled at Harvard University, where he took classes including Math 55 and graduate-level computer science courses, but he dropped out in 1975 to co-found and lead Microsoft. He served as its CEO for the next 25 years and also became president and chairman of the board when the company was incorporated in 1981. Succeeded as CEO by Steve Ballmer in 2000, he transitioned to chief software architect, a position he held until 2008. He stepped down as chairman of the board in 2014 and became technology adviser to CEO Satya Nadella and other Microsoft leaders, a position he still holds. He resigned from the board in 2020. Over time, Gates reduced his role at Microsoft to focus on his philanthropic work with the Bill & Melinda Gates Foundation, the world's largest private charitable organization, which he and his then-wife, Melinda French Gates, co-chaired from 2000 until 2024. Focusing on areas including health, education, and poverty alleviation, Gates became known for his efforts to combat transmissible diseases such as tuberculosis, malaria, and polio. After French Gates resigned as co-chair following the couple's divorce, the foundation was renamed the Gates Foundation, with Gates as its sole chair. Gates is the founder and chairman of several other companies, including BEN, Cascade Investment, TerraPower, Gates Ventures, and Breakthrough Energy. In 2010, he and Warren Buffett founded the Giving Pledge, whereby they and other billionaires pledged to give at least half their wealth to philanthropy. Named as one of the 100 most influential people of the 20th century by Time magazine in 1999, he has received numerous other honors and accolades, including a Presidential Medal of Freedom, awarded jointly to him and French Gates in 2016 for their philanthropic work. The subject of several documentary films, he published the first of three planned memoirs, Source Code: My Beginnings, in 2025.
Reader's Guide
William Henry Gates III was born on October 28, 1955, in Seattle, Washington, as the only son of Bill Gates Sr. (1925–2020) and his first wife, Mary Maxwell Gates (1929–1994). His ancestry includes English, German, and Irish/Scots-Irish. His father was a prominent lawyer, and his mother served on the board of directors of First Interstate BancSystem and United Way of America. Gates's maternal grandfather, J. W. Maxwell, was a national bank president. Gates also has an older sister, Kristi (Kristianne), and a younger sister, Libby. He is the fourth of his name in his family, but is known as William Gates III or 'Trey' (i.e., three) because his father had the 'II' suffix. The family lived in the Sand Point area of Seattle in a home that was damaged by a rare tornado when Gates was 7. When Gates was young, his parents wanted him to pursue a career in law. During his childhood, his family regularly attended a church of the Congregational Christian Churches, a Protestant Reformed denomination. Gates was small for his age and was bullied as a child. The family encouraged competition; one visitor reported that 'it didn't matter whether it was hearts or pickleball or swimming to the dock; there was always a reward for winning, and there was always a penalty for losing'. At age 13, Gates enrolled in the private Lakeside Prep School. When he was in the eighth grade, the Mothers' Club at the school used proceeds from Lakeside School's rummage sale to buy a Teletype Model 33 ASR terminal and a block of computer time on a General Electric (GE) computer for the students. Gates took an interest in programming the GE system in BASIC, and he was excused from math classes to pursue his interest. He wrote his first computer program on this machine, an implementation of tic-tac-toe that allowed users to play games against the computer. Gates was fascinated by the machine and how it would always execute software code perfectly. After the Mothers Club donation was exhausted, Gates and other students sought time on systems, including DEC PDP minicomputers. One of these systems was a PDP-10 belonging to Computer Center Corporation (CCC), which banned Gates, Paul Allen, Ric Weiland, and Gates's best friend and first business partner, Kent Evans, for the summer after it caught them exploiting bugs in the operating system to obtain free computer time. The four students formed the Lake
Did You Know?
- Gates scored 1590 out of 1600 on the SAT.
- He devised an algorithm for pancake sorting that held the record as the fastest version for over 30 years.
- Gates served as a congressional page in the House of Representatives in 1972.
- He was a national merit scholar when he graduated from Lakeside School in 1973.
- Gates's first computer program was a tic-tac-toe game that allowed users to play against the computer.
Notable Quotes (Wikiquote)
"If something is expensive to develop, and somebody's not going to get paid, it won't get developed. So you decide: Do you want software to be written, or not?" — Bill Gates "Interview with Dennis Bathory-Kitsz in 80 Microcomputing (1980) Clips from the interview can be found on "No Money (Lullaby for Bill)" by Dennis Báthory-Kitsz." — Bill Gates "It's not manufacturers trying to rip anybody off or anything like that. There's nobody getting rich writing software that I know of." — Bill Gates "Instead of buying airplanes and playing around like some of our competitors, we've rolled almost everything back into the company." — Bill Gates
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