Nick Shepherd

Nick Shepherd is an oil and gas lawyer with 25 years of industry experience in a number of senior in-house legal roles.  

Nick joined Zennor in July 2017, having been Regional General Counsel at Tullow Oil plc, where he was responsible for the legal team in the London Head Office. Previously Nick held senior legal roles in Paladin Resources plc, BHP Billiton Limited and Premier Oil plc and has also advised a large number of other upstream independents. 

During his time at Zennor, Nick has been instrumental in securing the legal structures that underpin the Finlaggan development, as well as helping deliver the Britannia/Mitsui transaction.


Marilyn Merryweather

Marilyn Merryweather

Marilyn Merryweather  is geophysicist with more experience than any other member of the Zennor team.  Another ARCO veteran she has been instrumental in c.20 discoveries in UK Central and Southern North Sea, such as Tyne West, Waveney, Hawksley, Glenelg, Murdock K, Munro, Polecat, Opal, Vanquish and Eos.

Following the acquisition of ARCO, Marilyn worked for BP, Tullow and EOG Resources and in 2006 joined the technical team at Zennor helping them to grow and mature the Company’s UK asset base through successful license round applications.

Marilyn’s most recent efforts at Zennor have focused on the identification and evaluation of potential infill locations in the producing fields acquired from First Oil in 2016.

Peter O’Mara

Peter O’Mara is a highly experienced geologist with knowledge across the upstream value chain gleaned from over 25 years with  ARCO, Ruhrgas, EOG Resources and Zennor.

Peter served as the main technical partner in multiple UK North Sea JV’s and was responsible for drilling, reservoir engineering, geoscience, subsurface efforts, development well planning and initial start-up of a number of fields and discoveries: Trent & Tyne’ CMS3, Elgin/Franklin, Scoter/Merganser, Conwy, Polecat, Arthur, Valkyrie and Columbus.

At Zennor, Peter has been responsible for the subsurface modelling of Finlaggan, through pre-appraisal and development phases including delivery of the subsurface element of the Field Development Plan.

David Beaghan

David Beaghan has over 30 years of oil and gas industry experience in planning and managing drilling operations. This includes UK and international exposure, onshore and offshore operations and periods supervising operations at the well site.

David has worked with a variety of operators ranging from large multinationals to small independents and was the Drilling Manager for the four offshore UK North Sea operated wells drilled by Zennor North Sea Ltd in the period 2012-16.

David’s leadership skills and eye for detail has made his step up to Operations Director appear seamless at Zennor, where he is responsible for all aspects of the Finlaggan development project.

Graham Cooper

Graham Cooper

Graham Cooper is a geologist with over 35 years of industry experience, of which the last 20 have been spent in commercial and business development roles. A large proportion of that time was spent in senior commercial roles in Shell, including Vice President–Commercial for Shell International Global Exploration and Head of the Commercial Academy for the entire Shell Group.

Graham joined Zennor in January 2016 from EnQuest plc where, as Head of Business Development since 2011, he was responsible for delivering a large number of North Sea focused acquisitions. 

Since joining Zennor, Graham has, amongst other transactions, delivered the First Oil acquisition in early 2016 and the Britannia acquisition from Mitsui, which was signed in September 2018.



Tushar Kumar

Tushar is a Partner of Kerogen Capital’s Investment and Portfolio Management Team. He is a senior member of the investments team in London, responsible for the management of the firm’s European investments and other key relationships in Europe. Tushar has over 18 years’ experience in investments and corporate finance in the energy industry. He was formerly Executive Director at Morgan Stanley’s Natural Resources Investment Banking group in London, and had previously worked with Kerogen team members at J.P. Morgan in Hong Kong. Tushar is also a Non-Executive Director of Pandion Energy and IGas Energy.

Tushar holds a BTech in computer science and engineering from Indian Institute of Technology and an MBA from Indian Institute of Management Ahmedabad. He is also a CFA charter holder.


Jason Cheng

Jason Cheng is the Managing Partner and Co-Founder of Kerogen Capital. Jason co-founded Kerogen and its predecessor Ancora Capital in 2007. Jason is responsible for the overall running of the firm, its investment strategy and digital transformation, portfolio construction and risk management, as well as sourcing and providing senior oversight on the portfolio. Jason has around 30 years’ commercial experience across investing, operations and investment banking. He was formerly Managing Director of Jade International Capital Partners Limited in Beijing, and had previously worked in energy investment banking at J.P. Morgan and Schroders. Jason is also a Non-Executive Director of Pandion Energy, Buried Hill and HKN Energy.

Jason holds a Masters degree (Finance and Management) from the University of Sydney and a Bachelors degree (Economics and Econometrics) from the University of Melbourne.


Alan Parsley

Dr Alan Parsley is an Advisory Board Member and chairs the Technical Committee at Kerogen Capital. He has over 45 years’ experience in the oil and gas industry, predominantly at Shell, where he held senior positions including Global Head of Exploration, Head of New Business Ventures. In his later career, he became Chairman of Shell Australia and Chief Executive of Shell Syria. He formerly served as a member of the board of Woodside Petroleum Ltd and is currently the Chairman of the board of Pandion Energy, and a Non-Executive Director of Buried Hill.

Alan graduated from the University of Edinburgh and holds a BSc and a PhD in Geology. He was a member of the Court of Heriot-Watt University from 2005 to 2011.


Martin Rowe

Martin Rowe co-founded Zennor and was appointed Managing Director in April 2014 on completion of a management buy-out.

Since starting out as a drilling engineer in 1991, and through his 10 years with Arco, Martin gained significant operational experience across the upstream engineering disciplines

After Arco, Martin began working with the junior E&Ps and his technical background is now allied to many years of experience across the commercial and financial sectors of the upstream industry.

Martin was instrumental in attracting Kerogen’s backing to the Company and delivering the cornerstone Finlaggan transaction, both of which were closed in 2015.

Rod Crawford

Rod Crawford, a 12-year Arco veteran, is another co-founded of Zennor.  He has spent over 35 years in the oil and gas industry undertaking acquisition, processing and interpretation of both land and marine seismic data.  Rod has led several multi-disciplinary subsurface teams looking at a diverse range of projects, ranging from exploration, appraisal to development.

At Zennor, Rod and his team have a very successful track record in competitive UKCS offshore license round applications, based on established technical work flows and methodologies designed to minimise exploration and appraisal risk.

Rod’s input to the Finlaggan project has been pivotal, through his leadership of the Dual Azimuth reprocessing of the Finlaggan area seismic data using Generalised Radon Transform (“GRT”) algorithms.