Senior Management

Tim Summers

Executive Chairman

Mr Tim Summers joined GMS in April 2019. He has thirty years’ experience in oil & gas, oilfield services and the manufacturing and engineering sectors. He has held a variety of Executive and Board roles with BP, TNK-BP, Renova AG, and Sulzer AG. He was Chairman of KCA-Deutag, Swiss listed engineering firm Oerlikon AG, and the privately-held oil & gas independent New Age Limited. Mr Summers is a Chartered Engineer with a BSc (Hons) in Chemical Engineering from the University of Manchester. He is a Fellow of the Institute of Chemical Engineers and the Institute of Mining, Metalurgy and Minerals, and is a Member of the Society of Petroleum Engineers.



Mr Steve Kersley joined GMS in June 2019. He brings a wealth of energy sector experience gained in over 35 years in the industry. Mr Kersley was previously Chief Financial Officer (CFO) of Tervita Corporation, a Canadian oilfield services business. Prior to that he spent three years as CFO of Abu Dhabi National Energy Company PJSC (TAQA), one of Abu Dhabi’s flagship companies vital in helping to deliver the economic strategy of the Emirate of Abu Dhabi. He led the successful capital restructuring at Tervita, and at TAQA he raised over $6bn in four bond issuances, while also fundamentally reshaping the company’s portfolio with US$2bn of acquisitions and US$1.5bn of divestments. Before these roles, he spent 24 years with Royal Dutch Shell, 10 as a Vice President, working in Asia, Europe and the Middle East. Mr Kersley is a Member of the Institute of Chartered Accountants for England and Wales (ICAEW) and has a BA (Hons) degree in Law from Birmingham University.



Mr Andy Robertson joined GMS in 2008. He was educated at Robert Gordon University with a BA in Accountancy and Finance and is an associate member of the Chartered Institute of Management Accountants. Prior to joining GMS, he spent six years working in the oil and gas industry for AMEC, having taken up postings in the UK, USA and China and had responsibility for finance operations in major oil and gas regions including Europe, Americas, Asia and the Middle East. These roles had a strong focus on delivering improvement/change to process, practice and procedure. He also has significant marine/shipping experience gained in a variety of finance-related roles with P&O and Coflexip Stena Offshore.



Mr Mark Preston joined GMS in 2008, bringing more than 20 years of commercial experience within the marine and offshore industry.  He is a Chartered Shipbroker with international business development experience gained in the oil and gas industry.  He has undertaken the commercial management and control of large scale projects which include the provision of Early Production Systems and the conversion of a Floating Production and Storage Facility for European clients.


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