Bill Gates

Microsoft co-founder; chair, Gates Foundation

Bill Gates co-founded Microsoft with Paul Allen in 1975 and led the company through the expansion of personal computing. He later shifted his full-time focus to philanthropy and now chairs the Gates Foundation. His other work includes clean-energy innovation through Breakthrough Energy and research interests pursued through Gates Ventures. In 2025, he announced an accelerated foundation spending plan with a scheduled closure in 2045.

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Bill Gates portrait
Photo: World Economic ForumCC BY 2.0 · Displayed in grayscale

At a glance

Bill Gates co-founded Microsoft with Paul Allen in 1975 and led the company through the expansion of personal computing. He later shifted his full-time focus to philanthropy and now chairs the Gates Foundation. His other work includes clean-energy innovation through Breakthrough Energy and research interests pursued through Gates Ventures. In 2025, he announced an accelerated foundation spending plan with a scheduled closure in 2045.

Current role
Chair and board member, Gates Foundation
Known for
Microsoft; Gates Foundation; Breakthrough Energy
Previously
Microsoft CEO; chairman; chief software architect
Other work
Gates Ventures; clean energy and global health innovation
Foundation timeline
Accelerated spending plan announced in 2025; planned sunset in 2045
Coverage
Software; public health; energy; AI

Sources checked . Selected career background and milestones.

Career, in context.

Selected research, leadership and career milestones, newest first.

  1. Accelerates the foundation’s spend-down

    Gates announces a plan to substantially increase giving over the next twenty years. The foundation changes its charter and sets 2045 as the date to sunset operations.

    Source: Gates Foundation ↗
  2. Leaves Microsoft’s board

    Microsoft announces Gates is stepping down from its board to devote more time to philanthropy, while saying he will continue as a technology adviser to its leaders.

    Source: Microsoft ↗
  3. Founds Breakthrough Energy

    Gates establishes Breakthrough Energy to support innovation addressing climate change. His later first-person account describes the need to develop technologies that can reduce greenhouse-gas emissions.

    Source: Bill Gates / Breakthrough Energy ↗
  4. Leaves Microsoft’s day-to-day management

    Gates transitions out of his daily role at Microsoft to spend more time on foundation work, while continuing as chairman for several more years.

    Source: Microsoft ↗
  5. Hands Microsoft’s CEO role to Steve Ballmer

    Ballmer becomes Microsoft’s second chief executive, succeeding Gates. The change marks a transition in company leadership while Gates continues working on Microsoft’s technology direction.

    Source: Microsoft company history ↗
  6. Establishes the merged Gates Foundation

    The William H. Gates Foundation and Gates Learning Foundation merge, creating the Bill & Melinda Gates Foundation. Gates later describes its initial focus on health, education and libraries.

    Source: Bill Gates ↗
  7. Microsoft goes public

    Microsoft’s shares begin public trading during Gates’s leadership, a milestone in the company’s development from a young software business into a larger public corporation.

    Source: Microsoft ↗
  8. Co-founds Microsoft with Paul Allen

    Gates and Allen establish Microsoft to build software for the emerging personal-computer industry. Gates’s foundation biography identifies their partnership and the year the company began.

    Source: Gates Foundation ↗

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