… Mass General Brigham Leadership Executive leader to replace Denis Stratford, who is retiring Rachelle Mainard, JD, MBA, CRA, an executive leader at the University of … for the MGH Institute of Health Professions. She succeeds Denis Stratford , who is retiring from the chief operating officer role after 25 years of service to the … Rachelle has the innate ability to innovate then integrate,” said Jones. “She is one of the most accomplished strategic thinkers I’ve had the pleasure of working …