Uber's HR chief steps down following racial discrimination probe.

Uber's Chief People Officer Liane Hornsey has resigned after a third-party firm investigated allegations that she routinely dismissed internal racial discrimination complaints.

She joined the company a month before former engineer Susan Fowler penned a blog post talking about the rampant sexual harassment and sexism she endured at Uber.

As head of the HR department, Hornsey served as one of the company's top spokespersons on issues regarding diversity and discrimination throughout the upheaval that followed. Bo Young Lee, the ride-hailing firm's first diversity chief, was even ordered to report to her instead of to the company's new CEO Dara Khosrowshahi.

Uber's Chief Legal Officer Tony West ordered a probe into the way she handles discrimination reports after a group of whistleblowers threatened to go public with their complaints if the company doesn't take action. The group, who told Reuters that they're Uber employees of color, also accused Hornsey of using discriminatory language against the company's Global Head of Diversity and Inclusion Bernard Coleman. They claimed that she threatened former executive Bozoma Saint John, who joined the company from Apple Music with the intention of fixing its internal cultural issues, as well.

In the email she sent to her team, Hornsey said her resignation might come "a little out of the blue" for some people, but she has apparently "been thinking about [it] for a while." Khosrowshahi also sent a company-wide email about her resignation, calling her "incredibly talented, creative, and hard-working."