Dave Parker was Technical Editor of New Civil Engineer magazine for 12 years before leaving in May 2006 to become a freelance author and journalist. His interests include microgeneration and structural safety, and he successfully campaigned for the setting-up of the CROSS confidential reporting scheme in the UK. Antony Wood is Executive Director of the Council on Tall Buildings and Urban Habitat and an Associate Professor at the Illinois Institute of Technology College of Architecture. His field of specialism is the sustainable design of tall buildings. His PhD explored the multi-disciplinary aspects of skybridge connections between tall buildings.