Technology titan, Microsoft, has invested billions of dollars in ChatGPT creator OpenAI and has been given a seat on the startup’s board.

The nomination was shared in a memo to OpenAI staff on Wednesday that was later posted to the company’s blog and included a list of priorities from the Chief Executive Officer, Sam Altman, about how the company would move forward.

The boardroom addition comes after OpenAI was thrown into tumult on November 17 when the company’s board fired Altman only to hire him back a few days later when staff and investors rebelled.

“Thank you for everything you have done since the very beginning, and for how you handled things from the moment this started and over the last week,” Altman told employees in the memo.

At the height of the drama, Microsoft offered to hire Altman and OpenAI’s 750-strong staff to join the Redmond, Washington-based company to continue their work there on artificial intelligence.

Instead, the board that dismissed Altman was overhauled, now including the addition of Microsoft as a non-voting measure.

Microsoft will join former United States Treasury Secretary and political power broker Larry Summers, who was added last week, as well as Silicon Valley veteran Bret Taylor.

OpenAI’s chief scientist, Ilya Sutskever, sat on the board that voted to remove Altman and has not been renewed.