In the spring of 2010 Christopher was appointed Associate Professor at the James E. Rogers College of Law of The University of Arizona. While an Academic Fellow at the Petrie-Flom Center, Christopher completed an article on expert witness bias in technical cases which proposes a litigant-driven solution. Christopher has worked on numerous other articles and projects including his co-authored article, Get Sick, Get Out: the Medical Causes of Home Foreclosures, which was completed while a Student Fellow at the Petrie-Flom Center in 2007. The article's finding that medical causes put 1.5 million people at risk of losing their homes has attracted national attention. During his fellowship, Christopher taught the class Health Care Reform and Financial Insecurity and co-taught the seminar Health Reform: Normative Empirical, and Policy Perspectives with his colleague Allison Hoffman.