Experience includes feasibility and detailed design for new and remedial works to slopes, earthworks, ground improvement, retaining walls and horizontal directional drill projects. In addition to detailed design, site roles have also included construction supervision, management, and validation of geotechnical works. Key roles and responsibilities have included supervising and managing ground investigations, geotechnical design lead for multidiscipline projects, designer’s geotechnical advisor (DGA) and ground risk assessments.

In 2010 Tristan became a Chartered Geologist of The Geological Society of London and a European Geologist, following this in 2015 he was added to the UK Register of Ground Engineering Professionals (RoGEP) as a specialist.