Doctor on Demand has announced that its Chief Medical Officer, Dr. Pat Basu, has left the company and will be replaced with the company’s medical director, Dr. Ian Tong. 

The company also announced that it signed its 400th employer customer and will begin offering psychiatric video visits nationwide starting today. Doctor on Demand has offered mental health via psychologist video visits since December 2014.

In a blog post written about Basu’s departure, Doctor on Demand CEO Adam Jackson said that Basu decided to leave the company so that he could to move to Chicago to get married and start a family with his fiancee.

“Pat has been an incredibly valuable member of our leadership team," Jackson said. "We would not be where we are today without his expertise and insight into the health care system and how it works best for patients.”

Basu worked at Doctor on Demand for almost three years. He joined in June 2013. Before working at Doctor on Demand, Basu was a White House fellow and before that, a physician at Stanford University.

The company's new chief medical officer, Dr. Ian Tong, has also worked at Doctor on Demand since June 2013. He previously worked at VA Palo Alto Health Care System and Stanford University School of Medicine.

Earlier this year, Doctor On Demand raised $50 million in a round led by Tenaya Capital with participation from new investors Qualcomm Ventures, Dignity Health, and 23andMe CEO Anne Wojcicki.