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Jack Stoddard, a longtime health-care executive, has been named as chief operating officer of the new health venture being launched by Amazon.com Inc., JPMorgan Chase & Co. and Berkshire Hathaway Inc. Stoddard started Tuesday, according to a statement from the still-nameless health venture. He’ll work with Atul Gawande, the Harvard surgeon and writer who was named in June to run the initiative. (Tracer, 9/4)

His hiring adds another influential executive to the team being assembled by Amazon and its partners to take on the U.S. health care system. For the past year, Stoddard has infused digital services into health benefits provided by Comcast, which is credited with crafting one of the nation’s most innovative approaches to employee health. (Ross, 9/4)