Jeff Chiu / AP

Gary Marcus, a research scientist who joined Uber four months ago as director of its AI labs, is leaving the company, according to sources. Uber bought Marcus' startup, Geometric Intelligence, in December, using its 15 employees to form a new artificial intelligence unit.

Marcus joins a long list of recent exits from the troubled company, with Uber's most future-leaning efforts especially hard hit. Other notable departures include product head Ed Baker, self-driving car engineer Raffi Krikorian and famous car hacker Charlie Miller, who is joining Chinese rival Didi.

Why it matters: Today's Uber is all about matching riders and drivers, but the company's future efforts in self-driving cars and machine intelligence require a type of talent in short supply. Uber, already facing a lawsuit from Google and its ongoing harassment investigation, may have a tough time replacing those who leave.

Update: Marcus has confirmed the move in a Facebook post, saying is moving back to New York and will be a "senior advisor" to Uber.

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Robert Mueller speaks out on Roger Stone commutation

Former Special Counsel Robert Mueller testifies before the House Permanent Select Committee on Intelligence on Capitol Hill on Wednesday July 24, 2019. Photo: The Washington Post / Contributor

Former special counsel Robert Mueller responded to claims from President Trump and his allies that Roger Stone was a "victim" in the Justice Department's investigation into Russian interference in the 2016 election, writing in a Washington Post op-ed published Saturday: "He remains a convicted felon, and rightly so."

Why it matters: The rare public comments by Mueller come on the heels of President Trump's move to commute the sentence of his longtime associate, who was sentenced in February to 40 months in prison for crimes stemming from the Russia investigation. The controversial decision brought an abrupt end to the possibility of Stone spending time behind bars.

Trump dons face mask during Walter Reed visit

Trump wearing a face mask in Walter Reed National Military Medical Center on July 11. Photo: Alex Edelman/AFP via Getty Images

President Trump wore a face mask during his Saturday visit to Walter Reed National Military Medical Center, according to AP.

Why it matters: This is the first known occasion the president has appeared publicly with a facial covering as recommended by health officials since the coronavirus pandemic began, AP writes.

Updated 6 hours ago - Politics & Policy

Coronavirus dashboard

Illustration: Sarah Grillo/Axios

  1. Global: Total confirmed cases as of 5:30 p.m. ET: 12,607,510 — Total deaths: 562,338 — Total recoveries — 6,948,863Map.
  2. U.S.: Total confirmed cases as of 5:30 p.m. ET: 3,228,884 — Total deaths: 134,600 — Total recoveries: 983,185 — Total tested: 38,919,421Map.
  3. Public health: Jimmy and Rosalynn Carter: "Please wear a mask to save lives" Fauci hasn't briefed Trump on the coronavirus pandemic in at least two months — We're losing the war on the coronavirus.
  4. Food: How the coronavirus pandemic boosted alternative meat.
  5. Sports: Charge of "money grab" by college football.
  6. World: India reimposes lockdowns as coronavirus cases soar.