Hennepin Healthcare Research Institute | 1,600 followers on LinkedIn. Hennepin Healthcare Research Institute (HHRI) has been actively investigating the causes of and potential treatments for diseases since it was founded as Minneapolis Medical Research Foundation (MMRF) in 1952. We support and oversee the medical research conducted at HCMC, Hennepin Healthcare's nationally recognized Level I Adult and Pediatric Trauma Center and acute care research and teaching hospital located in downtown Minneapolis. HHRI is one of the largest medical research non-profits in Minnesota.