Amazon has hired well-known cardiologist Maulik Majmudar for a new role, as it looks to move into the $3 trillion health-care sector.

Majmudar announced his new role on his Twitter account on Monday. Before joining the technology company, he worked as a cardiologist and associate director of the health-care transformation lab at Massachusetts General Hospital and he lectured at MIT. At the lab, he looked at how to incorporate the latest medical technologies into the practice of medicine.

Majmudar did not disclose the specific team he would be joining at Amazon, only that he would be taking on an "exciting and challenging role." He's advised technology companies in the past, such as Quanttus, a company that tried to track blood pressure from the wrist but ultimately failed.

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Amazon declined to comment. Majmudar did not immediately respond to requests for comment.

Amazon currently has a number of different teams working on health care and has been on a health-care hiring spree, bringing on experts including primary care expert Martin Levine and Taha Kass-Hout, former FDA chief health information officer.