His research focuses on international relations, with a specialization in foreign policy analysis and international security. He teaches courses including United States Foreign Policy, Introduction to International Relations, Comparative Foreign Policy, International Security, and International Relations on Film. Lantis has significant field research experience in international politics. He received a J. William Fulbright Senior Scholarship for research in Australia in 2007, where he served as Visiting Scholar in the Department of International Relations at the Research School of Pacific and Asian Studies at The Australian National University in Canberra and the School of Social Sciences and International Studies at the University of New South Wales in Sydney.