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What actually happened atGitHub

GitHub was built by four friends without taking a dollar of venture money — until a harassment scandal pushed out its highest-profile co-founder, and a $7.5B Microsoft deal ended its independence.

First work2007–2008
Founded2008
OriginSan Francisco, California
StatusA Microsoft subsidiary (acquired 2018); the dominant code-hosting platform.
Sources5 items
On the record

Why did Tom Preston-Werner resign — and what did the investigation establish?

Her account described gender-based mistreatment that the culture tolerated.

Julie Ann Horvath, 2014 · 1 source

The investigation cleared him of harassment/retaliation while noting judgment errors; he resigned rather than continue.

GitHub / Preston-Werner, 2014 · 1 source
This answer rests on
Julie Ann Horvath
Early Employee · statement · 2014
Tom Preston-Werner
Founder · statement · 2014
Reporting & filings
Documents cited · 2 items
The people

Who was actually there, and when

Chris Wanstrath
Founder2008 — 2018
No account

Co-founder who became CEO after Preston-Werner's 2014 resignation and led GitHub to the Microsoft acquisition.

Tom Preston-Werner
Founder2008 — 2014
No account

Co-founder and the company's most public figure/CEO; resigned in 2014 after an internal investigation into harassment allegations.

P.J. Hyett
Founder2008 — present
No account

Co-founder who worked with Wanstrath on the early product.

Scott Chacon
Founder2008 — 2015
No account

Git expert and co-founder; contributed early Git tooling and evangelism.

Julie Ann Horvath
Early Employee2012 — 2014
No account

Engineer/designer whose March 2014 public allegations of a hostile, gender-based environment — involving Preston-Werner and his wife — triggered the investigation and his resignation.

Marc Andreessen
Investor2012 — present
No account

Led Andreessen Horowitz's ~$100M investment — GitHub's first outside funding — and joined the board.

0 of 6 have put their version on the record.

The money

Who funded it, and who bought it

Microsoft
Acquirer
Microsoft

Announced June 4, 2018; closed October 2018

$7.5B
Andreessen Horowitz
Andreessen Horowitz
Series A lead · ~$100M · Jul 2012, board seat
Timeline

What happened, in order

20081 event
Feb

GitHub launches

Wanstrath, Preston-Werner, and Hyett launch GitHub (Chacon joins as a Git expert), building a social platform for code that grows rapidly among developers — without outside funding.

GitHub
Chris Wanstrath co-founded GitHub, which Microsoft bought for billions
20121 event
Jul

a16z invests ~$100M

After four bootstrapped years, GitHub takes its first outside money — a ~$100M investment from Andreessen Horowitz, then one of the firm's largest.

GitHub
20143 events · 3 contested
Mar

Julie Ann Horvath's allegations

Contested · 2 accounts

Julie Ann Horvath publicly alleged a hostile, gender-based environment in March 2014. GitHub placed Preston-Werner on leave and hired an outside investigator. The investigation found no harassment or retaliation but did find 'errors of judgment.' Preston-Werner resigned in April 2014.

Unresolved: How to reconcile a 'no harassment' finding with a resignation and 'errors of judgment.'

GitHub Puts Co-Founder On Leave, Begins Investigation Into Discrimination Against Julie Ann Horvath
Mar

Julie Ann Horvath's claim

Claim — not established history

That she experienced a hostile, gender-based work environment at GitHub involving Preston-Werner and his wife.

Claimed by Julie Ann Horvath, 2014
Response — GitHub / Tom Preston-Werner

GitHub's outside investigation found no evidence of harassment or retaliation but identified 'errors of judgment.' Preston-Werner denied the harassment claims yet resigned.

Partially resolved
GitHub Puts Co-Founder On Leave, Begins Investigation Into Discrimination Against Julie Ann Horvath
Apr

Preston-Werner resigns

Contested · 2 accounts

Julie Ann Horvath publicly alleged a hostile, gender-based environment in March 2014. GitHub placed Preston-Werner on leave and hired an outside investigator. The investigation found no harassment or retaliation but did find 'errors of judgment.' Preston-Werner resigned in April 2014.

Unresolved: How to reconcile a 'no harassment' finding with a resignation and 'errors of judgment.'

GitHub Denies Allegations Of 'Gender-Based Harassment,' Co-Founder Preston-Werner Resigns
20181 event
Jun

Microsoft acquires GitHub for $7.5B

Microsoft agrees to buy GitHub for $7.5 billion in stock (closing in October 2018), prompting anxiety among developers about the independence of the platform.

Microsoft to acquire GitHub for $7.5 billion
Chris Wanstrath co-founded GitHub, which Microsoft bought for billions
Where are they now

The beginning reads differently once you know the end

Chris Wanstrath

CEO 2014–2018; led the Microsoft sale; later an investor.

Tom Preston-Werner

Resigned 2014; continued as investor/creator (e.g., RedwoodJS).

P.J. Hyett

Co-founder; stepped back over time.

Scott Chacon

Left in the mid-2010s; later founded new developer tools.