Bill Gates allegedly left Microsoft due to investigation involving his relationship with a female employee

Microsoft Corp. board members decided that Bill Gates needed to step down from its board in 2020 as they pursued an investigation into the billionaire’s prior romantic relationship with a female Microsoft employee that was deemed inappropriate, people familiar with the matter said.

Members of the board tasked with the matter hired a law firm to conduct an investigation in late 2019 after a Microsoft engineer alleged in a letter that she had a s.e.xual relationship over years with Mr. Gates, the people said.

Mr. Gates resigned from the Microsoft board on March 13, 2020, three months after he had been re-elected to his seat. In a press release filed with regulators and a post on LinkedIn, the billionaire said then he wanted to focus on his philanthropy and would continue to serve as a technical adviser to Chief Executive Satya Nadella. That same day, he also vacated his board seat at Berkshire Hathaway Inc., the conglomerate run by Mr. Gates’s friend Warren Buffett.

A spokeswoman for Mr. Gates said, 

There was an affair almost 20 years ago which ended amicably. She said his decision to transition off the board was in no way related to this matter. In fact, he had expressed an interest in spending more time on his philanthropy starting several years earlier.

During the probe, some board members decided it was no longer suitable for Mr. Gates to sit as a director at the software company he started and led for decades, the people said.

Mr. Gates resigned before the board’s investigation was completed and before the full board could make a formal decision on the matter, another person familiar with the matter said.