Andrew gained a 1st Class award for his degree and also won the Skempton Prize in Soil Mechanics.

He first worked as a senior engineering management trainee for Western Region of British Railways before moving to the US to pursue graduate studies, and later joined the faculty at MIT where he served as Head of the Department of Civil and Environmental Engineering between 2009 and 2013.

Andrew's research has been widely used in the design of foundation systems for deepwater oil production facilities in the Gulf of Mexico. He has worked extensively on problems of soil-structure interaction for urban excavation and tunneling projects, including Boston's Central Artery-Third Harbor Tunnel and MBTA South Piers transit projects, as well as Tren Urbano, a subway system which began service in San Juan, Puerto Rico, in 2004.

In 2008 Andrew established the Center for Environmental Sensing and Modeling (CENSAM), an interdisciplinary research program through the Singapore MIT Alliance for Research and Technology (SMART). Through this program he has led research efforts to develop wireless sensor networks for monitoring water distribution systems and is currently the Chief Scientific Advisor for an associated start-up company, Visenti Pte. Ltd.