He attempted to obstruct an investigation into the relationship between his former employer and OxyContin-maker Purdue Pharma. Mar 9th, 2021 AP Photo BURLINGTON, Vt. (AP) — A Pennsylvania man pleaded guilty in federal court in Vermont on Monday to attempting to obstruct a federal investigation into the relationship between his former employer and OxyContin-maker Purdue Pharma, federal prosecutors said. As director of national accounts for Practice Fusion, a San Francisco-based health information technology company, in 2015 and 2016, Steven Mack, of Bridgeville, Pennsylvania, was the point of contact between the company and Purdue Pharma regarding investigations, the U.S. attorney's office for Vermont said.