David Fennell's main focus of research is on tourism ethics and ecotourism. He has published widely in these areas, including books on Ecotourism (5th edition), Tourism Ethics (2nd edition), Codes of Ethics in Tourism, Tourism and Animal Ethics (2nd edition), and Sustainable Tourism: Principles, Contexts, and Practices. A major thrust of his research involves theory from other disciplines to gain traction on tourism's most persistent problems. Fennell is the founding Editor-in-Chief of the Journal of Ecotourism, is the editor of a Routledge book series on tourism ethics and is the editor of two Routledge Handbooks: Tourism and the Environment, and Ecotourism.