Meet our Experts

Meet our Experts

Here we introduce some of the experts in GCA’s regional offices

- GCA's regions are: - Europe, Africa, Middle-East, Russia & Caspian - North and Latin America - Asia Pacific -
Dr D. Nathan Meehan

Dr D. Nathan Meehan

- Managing Director - nathan.meehan@gaffney-cline.com

Dr D. Nathan Meehan is a US licensed professional engineer with more than 40 years of global experience in reservoir engineering, reserves estimation, arbitration, field studies, hydraulic fracturing and horizontal well expertise.  He is the 2016 President of the Society of Petroleum Engineers (SPE) and has served on Boards of international oil and gas operating companies, service companies and software firms.  He is the recipient of multiple awards and has published more than 70 technical articles and three books.  

In Europe, Africa, Middle-East, Russia & Caspian

-
John Gaffney

John Gaffney

- Regional Director – EAME/RC - john.gaffney@gaffney-cline.com

John is the Regional Director for GCA in Europe, Middle East, Africa, Russia and the Caspian.  He has a diverse management background including over 15 years' international experience in Europe, South-East Asia, the Middle East and South America and is a member of SPE and SEAPEX

Felix Aquing

Felix Aquing

- West Africa Advisor - felix.aquing@gaffney-cline.com

A geologist with 40 years' oil industry experience, including 25 years at Shell, Felix's extensive experience ranges from wildcat exploration through to brown-field redevelopment.  At GCA he is a focal point and project manager for many West Africa projects and works closely with leading financial institutions.

Dr. John Barker

Dr. John Barker

- Reservoir Engineer - john.barker@gaffney-cline.com

Over 32 years John has worked on oil, gas and gas-condensate fields of all types.  An acknowledged expert in reservoir simulation and its use in reservoir development planning, he has extensive experience in reserves/resources estimations for stock market and other purposes and is a member of the SPEE.  He has also been Executive Editor of the SPE Reservoir Engineering journal.

Jeremy Berry

Jeremy Berry

- Business Development - jeremy.berry@gaffney-cline.com

Jeremy has a geoscience background and over 35 years’ industry experience.  He also has a broad understanding of related disciplines and business integration and practical experience of reserves/resources, asset valuation, M&A activities and new technologies.  Jeremy has worked extensively in Sub-Saharan Africa and presents widely on the subsurface and business opportunities there.  

Mike Cline

Mike Cline

- Strategy Advisor/Legal Counsel - michael.cline@gaffney-cline.com

Mike leads GCA’s Corporate Strategy Group and has over 30 years experience, including senior advisory engagements for national oil companies and sovereign institutions.  He develops the commercial and legal frameworks for foreign private investment and integrated project development in their oil and gas sectors.  

Charles Goedhals

Charles Goedhals

- Development Planning Advisor - charles.goedhals@gaffney-cline.com

Charles, a Principal Consultant at GCA, has over 35 years experience in oil and gas project management and associated technical and commercial functions.  Charles advises on field development definition, project execution planning, facilities engineering, cost estimating, and project management and surveillance.

Dr Mead Hussain

Dr Mead Hussain

- Reservoir Engineer - mead.hussain@gaffney-cline.com

Mead is a UK Chartered Engineer with over 30 year's industry experience worldwide, especially in Iraq, Libya, the Caspian region and Sub-Saharan Africa.  She is experienced in field development planning, reserves and resources assessments and is a long-standing contributor to governmental advisory projects.  Me'ad is also bi-lingual in English and Arabic. 

David Jarrett

David Jarrett

- Geoscientist - david.jarrett@gaffney-cline.com

David is a geoscientist with a particular expertise in geological modelling and reservoir characterisation in support of reserves estimation, reservoir simulation, equity negotiation and technical due diligence.  He has focussed particularly on East and West Africa and the Eastern Mediterranean

Rand Al-Obaidy

Rand Al-Obaidy

- Petroleum Engineer - rand.alobaidy@gaffney-cline.com

Rand is a Petroleum Engineer with worldwide experience but a particular focus on Egypt.  Her expertise is in oil and gas field development, reserves and resource evaluation and technical due diligence. Rand is bilingual in English and Arabic.

Ryan Pereira

Ryan Pereira

- Gas/LNG Advisor - ryan.pereira@gaffney-cline.com

Ryan is Global Director of GCA’s Gas & LNG practice.  He has over 15 years' global experience across the downstream, chemicals, midstream and LNG, and upstream sectors. Ryan holds a degree in economics and qualifications in management accounting, corporate finance and treasury, and project management.  Since joining GCA in 2014, Ryan has led projects covering LNG import and exports (including FSRU/FLNG), gas to power, M&A, sale and purchase agreements, gas disputes and arbitrations, gas market and utilisation studies, energy market reform, delivery of training and has authored several articles and book chapters for external publications covering global gas markets.

Sam Phillips

Sam Phillips

- Commercial/Development Planning Advisor - sam.phillips@gaffney-cline.com

Sam is a Chartered Engineer with 35 years' oil industry experience in commercial and project management and facilities engineering.  He advises on field development planning and regulatory compliance and on contractual issues around M&A activities, petroleum product handling, sales and project financing.

Richard Poole

Richard Poole

- Midstream/Downstream Advisor - richard.poole@gaffney-cline.com

Since his early career in the refining and chemical industry, Richard has been at GCA for over 25 years. As well as upstream advisory work, he has core midstream/downstream expertise in technical, commercial and strategic assignments in gas/pipeline/refining asset due diligence, gas monetisation, hydrocarbon product/market analyses and contracts.  

Drew Powell

Drew Powell

- Operations Advisor - drew.powell@gaffney-cline.com

Drew currently Global Operations Director for GCA based in the United Kingdom. He is responsible for ensuring the delivery of high-quality pertinent advice to GCA's clients. Drew is a chemical engineer with over 20 years’ petroleum industry experience and with a particular expertise in oil and gas field development, cost estimating and technical due diligence

Chris Rachwal

Chris Rachwal

- M&A/Strategy Advisor - chris.rachwal@gaffney-cline.com

A Technical Director with over 30 years' experience,  Chris is a key member of GCA’s Mergers and Acquisitions business practice. In conjunction with leading legal and financial organisations he leads multi-disciplined project teams assisting clients with asset/company purchases or sales.  He provides strategic business insight and technical assistance to oil companies and governments worldwide.

Dr Nick Stronach

Dr Nick Stronach

- Geoscientist - nick.stronach@gaffney-cline.com

Nick is a Senior Advisor in Geoscience, with 35 years’ experience with international petroleum operating and consulting companies.  He has a wide international knowledge of sedimentary basin evolution, petroleum and reservoir geology and petroleum system and play analysis and is a UK Chartered Geologist.

Jonathan Westbury

Jonathan Westbury

- Commercial Advisor - jonathan.westbury@gaffney-cline.com

Jonathan has over 37 years of experience in the petroleum industry.  During 26 years at Shell, he held the positions of Hydrocarbon Maturation Planning Lead, Head of Reserves Reporting and Geoscience Discipline Chief. Jonathan led and was involved in projects covering business development, field developments, and corporate business planning and reporting.  

Mike Wood

Mike Wood

- Development Planning Advisor - mike.wood@gaffney-cline.com

Mike, a Technical Director at GCA, has over 35 years' in the oil and gas industry, with experience in a wide range of technical and commercial functions.  Within GCA Mike provides advice on field development planning, project execution, facilities definition, cost estimating, and economic analysis, with a focus on technical / commercial due diligence for project finance or asset acquisition.  

Dr. Stephen Wright

Dr. Stephen Wright

- Geoscientist - stephen.wright@gaffney-cline.com

Stephen is Technical Director and a senior Geoscientist with more than 30 years’ experience with major oil companies including Shell, Enterprise, BP and Texaco.  Stephen is particularly involved in the assessment of oil and gas Reserves and Resources and the evaluation of exploration portfolios. He has worked in Europe, Central Asia, Middle East, Africa, the Far East and Latin America.

In North and Latin America

-
Florent Rousset

Florent Rousset

- Regional Director – Americas - florent.rousset@gaffney-cline.com

Florent is the Regional Director for GCA in the Americas region, based in Houston.  Florent has advised upstream players and Sovereigns in Asia Pacific, Middle East, Africa, North and South America.  Prior to this, Florent worked in economics and commercial roles within Baker Hughes and GCA based in Singapore and Houston and for Schlumberger Business Consulting based in Paris and Singapore.

Carlos Alvarez

Carlos Alvarez

- IOR/Reservoir Engineer - carlos.alvarez2@gaffney-cline.com

Carlos has more than 25 years oil industry experience in Venezuela, Mexico, Norway and USA. Carlos's career has focused on Improved/Enhanced Oil Recovery (IOR/EOR), and bringing these processes into the Field Development Plans for mature and extra-heavy oil reservoirs.  He provides technical assistance to clients worldwide and gives training courses on IOR for conventional and unconventional reservoirs. 

Daniel Amitrano

Daniel Amitrano

- Reservoir Engineer - daniel.amitrano@gaffney-cline.com

Daniel is a senior reservoir and petroleum engineer with over 25 years of experience in the international oil and gas industry.  He has an excellent technical background and his geographical areas of experience include Venezuela, Bolivia, Mexico, Peru, Ecuador, Gulf of Mexico, Colombia, Brazil and Argentina (North, West and South basins).

William B Cline

William B Cline

- Strategic Advisor - bill.cline@gaffney-cline.com

Bill has over 30 years' experience in the international oil and gas industry and has managed many of GCA's engagements with NOCs, governments and ministries in the Americas, Europe, Africa, Asia and the Middle East.  He combines GCA's technical and commercial analysis into integrated, decision-making support and advice, particularly with respect to property valuations (for transactional or dispute resolution purposes).  Bill also develops commercial and fiscal arrangements to link private sector capital and technology with sovereign or public sector petroleum resources. 

Alan Cunningham

Alan Cunningham

- Commercial Advisor - alan.cunningham@gaffney-cline.com

Alan is a Technical Director in GCA’s Houston office. He has over 40 years’ experience in the international oil and gas arena and has led organizations with as many as 2,000 employees. He has held senior technical and executive roles with Union Texas in Houston, Singapore and Jakarta and more recently as an energy policy specialist with The World Bank. Alan currently advises on fiscal policy, field development planning, reservoir performance and license round management. 

Nick Fulford

Nick Fulford

- Global Head of Gas/LNG - nick.fulford@gaffney-cline.com

Nick is Global Head of Gas and LNG for GCA, with 30 years of experience at British Gas, Centrica and Direct Energy, where he has held various senior executive and planning positions.  Nick was actively involved in British Gas’ early LNG growth prior to becoming assistant to Chief Executive Sir Roy Gardner where he played a major part in Centrica’s demerger. Nick subsequently led the company’s move into North America where he developed the strategy and executed the acquisition of Direct Energy. For the last three years, Nick’s focus has been on unconventional resource opportunities in the US and Canada.

P. Kevin Galvin

P. Kevin Galvin

- Facilities/Cost Engineer - kevin.galvin@gaffney-cline.com

Kevin has over 35 years of experience in project management and oil and gas field development, leading numerous successful major field developments and business transactions in most petroleum provinces in the Americas, the Middle East, Africa and Asia-Pacific.  He specializes in development planning, conceptual engineering studies and commercialization of oil and gas resources.  

Cesar Guzzetti

Cesar Guzzetti

- General Manager – Latin America - cesar.guzzetti@gaffney-cline.com

César manages GCA's activities in the Southern Cone of South America, notably Brazil, Argentina, Bolivia and Peru and is based in GCA's Buenos Aires office. He has over 30 years of project evaluation experience in negotiations, engineering and operations and considerable expertise in Project Management, Field Evaluation and Development, Reservoir Management and Project Valuation. César has travelled widely and his career has taken him to live and/or work in the FSU and Caspian, Asia, China, South, Central and North America and the Caribbean.

Nigel Jenvey

Nigel Jenvey

- Global Head of Carbon Management - nigel.jenvey@gaffney-cline.com

Nigel leads GCA's Carbon Management practice, helping clients understand the wide variety of options available that will ensure continued business success through the energy transition. He has over 23 years of global oil and gas industry experience in technology, exploration, development and production operations with major oil and gas operating companies. Nigel is an industry leader and expert in Carbon Capture, Use and Storage (CCUS) having previously held roles such as the chair of the CO2 Capture Project, chair of the North American CCS Association, and program chair of the Society of Petroleum Engineers CCUS Technical Section. 

Chao Li

Chao Li

- Reservoir Engineer/Geoscientist - chao.li@gaffney-cline.com

Chao has broad reservoir analysis experience, including performing log analysis, fluid substitution, AVO, seismic inversion, building 3D geologic models, predicting pore and fracture pressures and well performance analysis.  He is skilled in programming, including FORTRAN, C, C++ and VB, and is a skilled user of Petrel, Petra, Jewel Suite, SMT, PowerLog, DrillWorks, GridSTAT, Promat and CMG.

Asish Mohanty

Asish Mohanty

- Gas/LNG Advisor - asish.mohanty@gaffney-cline.com

Asish is an electrical engineer with 18 years of experience in the global gas industry, including commercial, business development and transactional experience in global oil and gas player and LNG, advisory experience and business development.  His experience encompasses the Asia-Pacific and Atlantic basins, the gas and LNG value chains, and an extensive network of relationships in the energy industry.

Joshua Oletu

Joshua Oletu

- Petrophysicist - joshua.oletu@gaffney-cline.com

Joshua has over 20 years of experience in deepwater E&P operations, reservoir characterization, project management and decision analysis.  He has extensive global experience in petrophysical evaluation of conventional (clastics, carbonates, fresh water, heavy oil) and unconventional (tight gas, shale gas/oil, coal bed methane) reservoirs.  Joshua is also very proficient in the use of petrophysical analysis software such as Techlog, Interactive Petrophysics (IP), Crystal Ball for probabilistic modeling and Precision Tree for decision analysis.

Nelson Ollier

Nelson Ollier

- Business Development Manager - nelson.ollier@gaffney-cline.com

Nelson is based in GCA’s Buenos Aires office, with over 25 years of experience in management and business development in the energy and oil & gas, IT and telecom industries. His areas of expertise include business development and client management, fiscal and financial models, and portfolio management.

Gustavo Ritondale

Gustavo Ritondale

- Reservoir Engineer - gustavo.ritondale@gaffney-cline.com

Gustavo is a diversified oil petroleum engineer with more than 20 years of broad experience with proven ability to add value via economic and engineering analysis. His work has included reservoir engineering, focus in field development and production growth, reserves assessment and production forecast, project economic analysis, well performance, pressure transient analysis, integration of well test information in dynamic models, PVT analysis, RTA analysis and injection fall-off test analysis, and reservoir modeling. He has been actively involved in the development of Unconventional projects in Midland, Texas.

Rawdon Seager

Rawdon Seager

- Global Head of Quality Assurance - rawdon.seager@gaffney-cline.com

Rawdon is a Technical Director responsible for Global Quality Assurance within GCA and has over 40 years of experience in the international oil and gas arena. He has managed numerous field studies, reserve assessments, and asset evaluations. He has made presentations within the industry relating to reserves estimating and reporting issues and has given expert testimony during arbitration hearings. He is Past-Chairman of the SPE Oil and Gas Reserves Committee.          

Katerina Vassilellis

Katerina Vassilellis

- Geophysicist/Geologist - katerina.vassilellis@gaffney-cline.com

Katerina has more than 20 years of experience in the international oil and gas industry.  She has been a key contributor in a significant number of integrated geological and engineering studies for a wide variety of objectives from exploration to exploitation and development of conventional and unconventional hydrocarbon resources around the world.

In Asia Pacific

-
Arse K. Clarijs

Arse K. Clarijs

- Regional Director – Asia Pacific - arse.kusumastuti@gaffney-cline.com

Arse is the Regional Director for GCA in Asia Pacific and based in Singapore. She has over 25 years’ experience with major and independent oil companies.  Arse joined GCA in 2004 and has managed various studies, reserves and resources assessments, project acquisitions and divestments.

David Hayes

David Hayes

- Business Development Manager - david.hayes@gaffney-cline.com

David is a corporate planner with over 20 years’ experience in the Asian oil industry with strengths in mergers and acquisitions, business analysis, strategic planning, business development, valuations, and project evaluation.  He has held positions in Caltex, ExxonMobil, Singapore Petroleum Company, Commonwealth Bank of Australia and Scotia Waterous, based in Singapore.  David is Chairman of Singapore Society of Petroleum Engineers (SPE). 

Stephen Lane

Stephen Lane

- Quality Assurance, Asia Pacific - stephen.lane@gaffney-cline.com

Stephen is a Technical Director responsible for Quality Assurance within GCA Asia Pacific. He has over 40 years’ experience of providing geological and petrophysical expertise to worldwide clients.  Stephen has managed and been involved in reserves and resources assessments, valuation of E&P assets for acquisition and divestment purposes, and production of public documents such as Competent Person’s Reports. 

Doug Peacock

Doug Peacock

- Geologist - doug.peacock@gaffney-cline.com

Doug is a Technical Director with GCA in Singapore and has over 35 years’ experience in geology and petrophysics with a particular emphasis on 3D reservoir modelling.  His geological modelling experience covers all types of reservoirs in many parts of the world and ranges from building models for field development planning and reserves estimation purposes to reviewing and auditing models built by others.  He has also worked extensively on reserves estimating, unconventional reservoirs, acquisitions and divestments as well as technical projects.  Doug was an SPE Distinguished Lecturer in 2010-2011 and was a member of the SPE Oil and Gas Reserves Committee from 2013-2016.

Zis Katelis

Zis Katelis

- Geophysicist - zis.katelis@gaffney-cline.com

Zis is a Technical Director and has a career spanning over 25 years working on seismic processing, interpretation projects and workflows, log data analysis as well as contributing to and leading integrated technical studies.  He has held various management positions for a major international oil and gas service company for both technical and operational business segments in Australia, Asia and the Middle East.  Zis advises on exploration and development technical projects as well as contributing to reserves and resources assessments and technical and commercial studies for conventional and unconventional reservoirs.

Andrew Duncan

Andrew Duncan

- Facilities/Costs Engineer - andrew.duncan@gaffney-cline.com

Andrew has a background in Facilities Engineering who has over 30 years’ of worldwide experience including at several international operating companies.  He is an experienced project manager who has held a wide range of senior leadership roles within Southeast Asia, especially Indonesia.  Andrew has experience of acquisitions and divestments in his NBD roles for various Operators and with GCA.  

Peter Adam

Peter Adam

- Reservoir Engineer - peter.adam@gaffney-cline.com

Peter has over 25 years of worldwide experience including several international service and operating companies. He is an experienced reservoir engineering manager who has held a number of senior leadership roles, with significant experience of working in Indonesia. He also has experience of acquisitions and divestments and estimation of reserves and resources for various operators.  Peter is active within the SPE and the Indonesian Petroleum Association (IPA), and he is a past Chairman of technical committees to organize major conferences.

Dr Azlan Majid

Dr Azlan Majid

- Petrophysicist/Reservoir Engineer - azlan.majid@gaffney-cline.com

Azlan has 16 years’ of worldwide experience and specializes in petrophysical analysis of conventional and unconventional reservoirs.  He has wide-ranging experience in managing and performing reserves and resources assessments, project acquisitions and divestments, and specialized technical projects.  He has frequently been involved in establishing Reserves and Resources Management Systems in national oil and gas companies.

Dr Hu Yundong (Don)

Dr Hu Yundong (Don)

- Geoscientist - yundong.hu@gaffney-cline.com

Yundong had 25 years’ experience in the oil industry before he joined GCA in 2008. He has previously worked as a Senior Engineer for PetroChina and an official consultant for the Petroleum Reserves Office (PRO) of China. His experience is mainly in oil and gas reserves and resources evaluation, technical due diligence, and resource policy study.

Dewi Sri Redjeki

Dewi Sri Redjeki

- Petroleum Economist - dewi.redjeki@gaffney-cline.com

Dewi has over 25 years of experience including more than 10 years in multi-national oil and gas companies in Indonesia. She is an experienced commercial analysist with exposure to various technical and commercial projects. Dewi has managed oil and gas reserves and resources assessments, due diligence, assets acquisition and divestment, and various market studies.

We're here to help