Daniel Polsky of the Perelman School of Medicine and the Wharton School and Janet Weiner of Medicine are highlighted for studying how many doctors were in the health-insurance networks available to customers receiving health-care via the Affordable Care Act.
http://www.philly.com/philly/news/nation_world/20150707_Finding_which_doctors_are_in_Obamacare_networks_is_difficult.html Philadelphia Inquirer