After a development career, Ian Ellingham now focuses on research, writing, and teaching. He is a vice-president of Corinium Development Strategies and an associate of Cambridge Architectural Research Limited. Ellingham holds graduate degrees in Land Economy and Urban Studies from Cambridge University. He has co-authored the books 100+25 Years: OAA Perspectives on a Quarter Century (2006, OAA); Whole Life Sustainability (2013, RIBA Publishing), and New Generation Whole-Life Costing: Property and Construction Decision-Making Under Uncertainty (2014, Taylor & Francis). He has also published widely in academic and building industry publications.