Professor Sun teaches both undergraduate and graduate courses in Organizational Behavior and Managing People in Organizations. His research focuses on human motivation, creative and proactive behaviors, and mental health, with a particular emphasis on how leadership and organizational climate affect these outcomes. His research has been conducted among a diverse range of groups, including new labor market entrants, entrepreneurs, and organizational managers and employees. He has authored and co-authored more than twenty research papers and book chapters on these topics, and his research findings have been featured in the college textbook Organizational Behavior. Prior to joining Freeman School, Professor Sun taught graduate courses in Business Innovation and Sustainable Development and Managing Organizational Change at the Maastricht University School of Business and Economics in the Netherlands.