His professional interests include energy policy, sustainable energy, distributed generation, power quality, social and ethical implications of engineering and technology. He has authored or co-authored over 70 peer-reviewed journal and conference papers. O'Neill-Carrillo was the founding Director (2007)(2008)(2009)(2010) of the Institute for Tropical Energy, Environment, and Society, leading a group of 15 professors from 10 disciplines in establishing links between energy research and society and influencing energy policy in Puerto Rico (http://iteas.uprm.edu/). O'Neill-Carrillo was also the Education Coordinator at UPRM for the NSF's Center for Power Electronics Systems (CPES) from 2000-2008. He was Associate Director, CIVIS: Center for Resources in General Education, assisting in the administration of the Center, as well as developing student learning modules (sustainability, ethics), a sustainable energy initiative and coordinating the interaction and work of professors from various disciplines in UPRM. He has been energy Advisor for city governments and state agencies in Puerto Rico. He is one of the authors of the study "Achievable Renewable Energy Targets for Puerto Rico's Renewable Portfolio Standard," presenting the potential of renewable energy in Puerto Rico (http://www.uprm.edu/aret). He is also very active in the energy policy debate in Puerto Rico, authoring "Una Nueva AEE," a Spanish document that traces the history of the Puerto Rico Electric Power Authority, presenting potential reforms to the Island's electric system (http://iteas.uprm.edu/recursos.php). O'Neill-Carrillo is a founding member of the Puerto Rico Electric Energy Round Table, a multi-sector group that works on technical and policy alternatives for the future of Puerto Rico's electric system, acting as the Group Coordinator from 2008 to 2010. He is a Senior Member of IEEE, an ABET Program Evaluator and a registered Professional Engineer. His views and work on integrative research and education activities, and his professional service have earned O'Neill-Carrillo UPRM's Outstanding ECE