His areas of interest include civil-military relations in Latin America; UN peacekeeping participation by South American countries; Latin American comparative foreign policy, and nuclear policy in Argentina, Brazil and Mexico. His publications have appeared in Security Studies, International Peacekeeping, Journal of Latin American Politics and Society, Hemisphere, Nonproliferation Review and other edited volumes. Sotomayor has held research fellowships from the Woodrow Wilson Center for International Scholars, Tulane University, and CIDE in Mexico City. He received his M.A., M.Phil. and Ph.D. in political science from Columbia University and his BA degree in international relations from the Technological Autonomous Institute of Mexico (ITAM).