Gulasekaram's research focuses on the constitutional rights of noncitizens and federalism concerns in immigration law. He is co-author of the leading immigration law casebook used in law schools (Immigration & Citizenship: Process and Policy (West Academic 9th Ed. 2021)). His book, The New Immigration Federalism, provides an in-depth empirical and theoretical analysis of the resurgence of state and local immigration lawmaking. He has also extensively explored the relationship between the Second Amendment and immigrants, as a way of understanding constitutional protections for noncitizens. In addition to his scholarly publications, Professor Gulasekaram frequently comments on constitutional and immigration developments for media outlets, and contributes opinion pieces for the L.A. Times, The Washington Post, and blogs for various national outlets. He is a graduate of Brown University and Stanford Law School.