Meet the team
Engineering experience. Direct access. Personal responsibility.
Our directors combine offshore operations, engineering, project delivery and commercial management. They stay close to the work, giving you a clear point of contact and practical decisions from people who understand your project.
Garry McGowan
CEng · CMarEng · CMgr · MIMarEST · MCMI
Managing Director
Garry is a Chartered Engineer, Chartered Marine Engineer and Chartered Manager with more than 20 years of mechanical, marine and offshore experience.
His career spans precision engineering, the Royal Navy Submarine Service, offshore drilling and international scientific expeditions. He combines hands-on technical knowledge with operational leadership and client representation.
At Terra, Garry leads technical direction, operations and strategy, with direct involvement in engineering delivery, quality and specialist equipment development.
Declan Duncan
MCMI
Business Development & Project Management Director
Declan connects client requirements with practical project delivery. His experience covers project management, business development, stakeholder engagement and continuous improvement.
He works with clients, suppliers and project partners on planning, commercial development and risk management, and coordinates Terra’s internal engineering and development projects.
Mike Coltman
Commercial & Business Systems Director
Mike brings more than 30 years of experience in procurement, contracts, supplier management and business systems across public and private sector organisations.
He leads Terra’s commercial governance, procurement and business systems, supporting project delivery through clear processes, strong supplier relationships and effective commercial control.
Specialist support when you need it
Our core team works with experienced engineers, technicians and specialist suppliers to match the demands of each project, from fabrication and inspection to offshore delivery.
Design & workshop integration
Leon Smillie
Project Engineer
Design & Workshop Integration
Independent contractor working with Terra through his own limited company.
Leon supports Terra’s engineering design and equipment development, connecting CAD models and technical documentation with the practical requirements of the workshop.
He holds a Bachelor of Engineering in Aero-Mechanical Engineering from the University of Strathclyde. His contribution spans concept development, assembly modelling, interface reviews and drawing preparation, alongside the development of practical machining, welding and fabrication skills.
Within the vibrocorer programme, Leon’s engineering reports document the progression of the assembly model, preliminary static studies and design details through internal review.
Young Professionals Green Energy Awards, Scottish Renewables.