His research focuses on communication policy and regulation, critical political economy, critical geography, comparative media systems, localism, and local news. Christopher has worked for the Federal Communications Commission, submitted research to the Swiss Office of Communication, consulted with the South Korean Committee on the Impact of Media Concentration, and was part of a consortium of researchers, activists, and practitioners intervening at the Canadian Radio-television and Telecommunications Commission regarding community and local media. He is also a Fellow at the Tow Center for Digital Journalism at Columbia University.