Lyft’s chief operating officer Rex Tibbens will be stepping down from his role by the end of the year, CEO Logan Green told staffers in an email on Monday.
Tibbens had been at the now-$11 billion company for more than two years. Before joining Lyft, he was at Amazon, where he worked on parts of the company’s Prime Now service, as well as its Global Kindle Services.
Tibbens’s departure comes as Lyft is seeing significant momentum in terms of both its ride-hail business and self-driving partnerships. The ride-hail company, which has seen a major bump in its marketshare across the U.S., is also eyeing international expansion, according to a few sources. The Information reported that the company was looking into launching in Canada.
So it’s a tricky time for Lyft to be without a COO. But Green said the search for Tibbens’s replacement is under way.
As for Tibbens, the company said it was his decision to leave. It’s unclear where he’ll land next. In his email, Green said Tibbens will be spending time with family and advising other companies while he finds out what’s next.
Here’s the full email:
From: Logan Green
Date: Mon, Nov 6, 2017 at 6:08 PM
Subject: Thank you TRex!
To: ALL Company
We wanted to share a note of thanks to Rex and provide a leadership team update. After 2+ years with Lyft, helping grow the business over 10x, Rex has decided that at the end of the year he will move on from his role as COO. In the new year, he’ll spend time advising companies, reacquainting himself with his family, and figuring out what’s next for TRex. He’s been an incredible partner helping bring Lyft to every state, and launching strategic initiatives like Express Drive and our Nashville support center.
To lead the charge for Lyft’s next phase of growth, we’re underway with the search for our next COO. We’re extremely thankful for the impact Rex has had on all of us, and excited by the opportunity to bring in new leadership to drive forward our next chapter.
Logan & John
CEO & Co-founder
This article originally appeared on Recode.net.