 In Boston Business Journal's 2016 feature on the growth of private Massachusetts companies, it has named Health Dialog as "one of the area's 50 fastest-growing companies as well as one of the area's 100 largest private companies", with a two-year sales growth of 179% and a revenue of $136 million in 2005 making it the 5th largest 2005 revenue.In 1967, John Wennberg began documenting geographic variation in healthcare.In 1988, he founded the Center for Evaluative Clinical Services (CECS) at Dartmouth Medical School.