Lennon is an Associate Professor in Real Estate Economics and Finance at The University of Hong Kong. He is a General Practice Surveyor (Valuer) by profession. His principal research interests are in new institutional economics (NIE) and urban studies. Lennon was a Senior Fulbright Scholar at The University of Washington. He also held visiting faculty posts at the Law School and the Booth School of Business in The University of Chicago. His study has been published in the Journal of Law & Economics, Habitat International, Cities and Urban Studies etc. Lennon also acted as a Co-Guest Editor of a special issue of the Habitat International 2013 on Low Carbon Cities.
Lennon was a faculty member and an active consultant when he worked in The Hong Kong Polytechnic University. Major clients that Lennon served include the HKSAR Government (Central Policy Unit, Works Bureau, Estate Agents Authority), quasi-government bodies (Consumer Council, Hong Kong Examinations and Assessments Authority), think-tanks and professional bodies (Bauhinia Foundations, Hong Kong Institute of Surveyors), as well as private companies (HSBC, MTRC, Chesterton, Commercial Press and Oxford University Press etc).
For public services, Lennon was a member of the Authorized Persons Registration Committee, a member of the Real Estate Service Training Board, Part I Assessor of HKIS GPD, and a panel member of the Hong Kong Council for Academic Accreditation & Vocational Qualifications.