Alastair is a chartered geotechnical engineer with experience in design, management and construction of a large variety of civil engineering projects both offshore and onshore. He is also one of the two founding partners of Wood Thilsted Partners Limited. Prior to starting WT Alastair was leading the geotechnical detailed design of monopile foundations for all DONG Energy (now Ørsted) offshore wind projects. This included development of in-house design tools, and implementation of quality control and assurance procedures on all projects. It has also included obtaining project certification and third party approvals a large number of projects.

From 2012 to 2015, Alastair founded and provided the technical leadership for the international joint industry PISA project, which will develop new design guidance for offshore piles specifically for offshore wind turbine foundations. Alastair is chairman of the steering committee of the Imperial College and University of Oxford research project ALPACA.