As United States President Donald Trump remains hospitalised at Walter Reed National Military Medical Centre after testing positive for the coronavirus, one doctor is at the centre of his treatment: Dr Sean Conley, the White House physician.
Here is what is known about Dr Conley.
He became the President's physician two years ago. Dr Conley took on the role of White House physician in 2018, after Dr Ronny Jackson was nominated to be secretary of the Department of Veterans Affairs.
Dr Jackson withdrew his name from consideration for that post amid accusations of inappropriate workplace behaviour and was subsequently promoted by Mr Trump to the position of assistant to the President and chief White House medical adviser. He is now running for a House seat in Texas.
In March 2018, Dr Conley was named acting White House physician, and he was officially appointed to the position by Mr Trump in May 2018.
Dr Conley specialises in osteopathic medicine.
He graduated from the Philadelphia College of Osteopathic Medicine in 2006, according to records from the Virginia Board of Medicine.
Doctors of osteopathic medicine tend to emphasise community medicine and preventive care, take a more holistic approach to medicine and rely heavily on physical diagnosis compared with traditional doctors of medicine.
Dr Conley, who received his Bachelor of Science degree from the University of Notre Dame, has served as an emergency doctor for the US Navy since 2006.
A native of Pennsylvania, he completed his residency at the Naval Medical Centre in Portsmouth, Virginia, in 2013. After his residency, Dr Conley served as chief of trauma for the Nato Role 3 Multinational Medical Unit in Afghanistan. He served as director of the medical centre's combat trauma research group for a little over two years.
He supported Mr Trump's taking hydroxychloroquine.
In May, Dr Conley gained attention after revealing that Mr Trump had started taking hydroxychloroquine, an anti-malaria drug, while under his care.
Several experts have questioned the drug's effectiveness in treating, preventing or curing Covid-19, despite claims from Mr Trump.
The Food and Drug Administration warned in April that the drug should be used only in clinical trials or in hospitals. The agency also said the drug could cause dangerous heart rhythm problems.
In a letter in May discussing Mr Trump's use of hydroxychloroquine, Dr Conley said he and the President had "concluded the potential benefit from treatment outweighed the relative risks".
At a news conference last Saturday, the physician told newsmen that Mr Trump was not taking hydroxychloroquine. "We discussed it. He asked about it. He's not on it now," Dr Conley said.
NYTIMES