He teaches the Human Situation sequence, along with courses in ancient, medieval and early modern political philosophy, American political thought, American foreign policy and energy studies. His current research is focused on the political rhetoric and writings of Will Rogers. Prior to his appointment in the Honors College, Dr. Hallmark worked in the international oil and gas industry, where he had a 30-year career as a political risk analyst. He has been an advisor to international oil exploration and service companies, financial institutions and governmental agencies, including the World Bank, U.S. Department of Defense and members of the intelligence community. He is the Honors College coordinator for the minor in Energy and Sustainability Studies.