Jonathan Gammon was Technical Director for Tunnelling and Geotechnics at CH2M (now Jacobs) at the time of his retirement from full-time work in August 2017. He is now Non-Executive Director and Advisor at Instrumentation and Monitoring (I&M) specialists Geotechnical Observations Limited.
A Chartered Civil Engineer, Chartered Geologist, and European Registered Engineer, he has forty-five years of international construction experience working for consultants and contractors. His design office and site supervision experience encompass a broad range of projects on land, nearshore, and offshore at locations ranging from the UK to New Zealand. He has lived and worked in the UK, Switzerland, Hong Kong, and New Zealand.
Jonathan was Design Manager and Resident Engineer for tunnel and underground station works for West Rail in Hong Kong and was Sub-Surface Design Manager for the Reference Design of Dublin Metro North (renamed Metrolink) in Ireland; his was responsible for the main, system-wide, ground investigations for both projects. His experience in London includes Crossrail, Thameslink (Blackfriars Station Redevelopment), Tideway Tunnels, and the Northern Line Extension (for which he was the Expert Witness, Engineering at the Public Inquiry). He was Design Project Manager for the Bond Street Station Upgrade in Central London.
Jonathan spent more than two years working on High Speed Two (HS2) as Head of Ground Investigations. The scope of that work included tunnels and related works and cuttings and embankments of varying configurations and lengths in widely differing ground conditions over the 230km length of Phase One of HS2 between London and Birmingham. His last major project while at CH2M was the River Humber Pipeline Replacement Tunnel and related works.
He is a member of the British Geotechnical Association, the British Tunnelling Society, and the Railway Civil Engineers Association. He continues to be a member of the UK Chapter of the Hong Kong Institution of Engineers and the UK Branch of Engineering New Zealand, of which he is a Fellow. In 2020, he introduced and now leads an Instrumentation & Monitoring Working Group at the Association of Geotechnical and Geoenvironmental Specialists (AGS), of which he is a Past-Chairman.