About Us
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Who We Are
Future Thinking.
As global energy consultants, GLJ’s expertise has evolved over the past 50 years to meet the world’s need for responsible, sustainable energy. Our team of engineers, geoscientists and business professionals are international leaders in both emerging and traditional energy services. We are future-thinking and have a proven track record of helping our clients find the right sustainable solution to thrive in our new world of energy.
GLJ helps businesses navigate the changing landscape and gives them confidence when taking the next step with tailored sustainable strategies. Regardless of the phase of your project, or your business sector, our talented team is here for you!
Executive
Jodi L. Anhorn 
M. Sc., P. Eng.
President & CEO
Jodi joined the firm in 1993 and is responsible for corporate evaluations, acquisitions and divestiture projects. His extensive experience includes reserves and resource evaluation, detailed field development studies and rate transient analysis. Jodi is an expert in the preparation of domestic and international unconventional resource assessments and the appropriate securities disclosure rules. He served as the project lead on multi-discipline asset teams where he provided buy-side technical and economic analysis.
Caralyn P. Bennett
P. Eng.
CSO & Executive Vice President
Ms. Bennett is Executive Vice President and Chief Strategy Officer of GLJ, where she specializes in reserves and resource governance, emerging technology, energy diversification, business collaboration and strategy. Ms. Bennett serves as a committee member of the Petroleum Advisory Committee to the Alberta Securities Commission, the Industrial Curricular Advisory Board, Department of Civil and Environmental Engineering for the University of Waterloo and the Membership and Recognition Committee of the Society of Petroleum Engineers, Calgary Chapter. She sits on the Board of publicly traded transformational clean-tech innovator Acceleware Ltd, is Co-Chair of the Canadian Society of Unconventional Resources and is the President of the Canadian Heavy Oil Association. Ms. Bennett has a Professional Engineer designation with an Honours B.A.Sc. in Geological Engineering from the University of Waterloo.
Chad P. Lemke
P. Eng.
COO & Executive Vice President
Chad joined GLJ in 2004 and is responsible for client corporate evaluations, as well as evaluations for disposition and acquisition purposes. His expertise includes domestic and international reservoir studies, corporate reserve evaluations, resource assessments and expert witness testimony. Chad has extensive experience evaluating unconventional and shale resources around the world, including the Duvernay (Alberta, Canada), Utica (Northeast U.S.) and Vaca Muerta (Argentina).
Leaders
Tracy Bellingham
P. Eng.
Vice President
Tracy joined GLJ in 2004 and has been responsible for leading a wide variety of public and private corporate reserves and resource evaluations, A&D transactions and financing support, reservoir and supply study projects and overseeing the standards, protocols and expert team regarding GLJ’s in situ bitumen evaluations. During her first several years at GLJ, Tracy was part of the Emerging Business Services Group. In this role, she assisted emerging public and private companies in the evaluation of their oil and gas properties to support growth and development, corporate needs, banking, and regulatory reporting requirements. She has been actively involved in thermal evaluations since 2011 and has hands on experience evaluating an extended list of producing, planned and conceptual in situ oil sands projects throughout Western Canada.
Gabriella Carrelli
MSc., P. Geol.
Vice President
Gabriella has more than 20 years of experience in geological studies and evaluations of oil and gas fields and emerging energy resources such as Lithium. Prior to joining GLJ, Gabriella’s experience included employment with The Geological Survey of Canada and working as an exploration and development geologist for several oil and gas companies. In 2011, Gabriella joined GLJ as a Senior Geologist and later became the Manager of Geosciences. Gabriella has conducted and managed a wide variety of geoscience evaluations throughout Canada and around the world. Gabriella was instrumental in developing GLJ’s Indigenous commitment statement.
Tim R. Freeborn
P. Eng.
Vice President, Mineable Oil Sands and Shales
Tim has been with the firm since 1999 and is responsible for corporate evaluations, as well as disposition and acquisition projects. He has been involved in a variety of reservoir engineering and economic evaluations in the Western Canadian Sedimentary Basin including coal bed methane (CBM), heavy oil and enhanced oil recovery projects. Tim is responsible for the evaluation of all of the operating integrated mineable oil sands projects in Alberta for various clients. Tim is also excited to be leading GLJ’s Biomass and Biofuels group, and hopes his expertise in bitumen extraction and upgrading can be applied to support the growing Biomass & Biofuel industry.
Leonard L. Herchen
P. Eng.
Vice President, Technical Advisory
Leonard joined GLJ in 1993 and is principally responsible for international and Canadian frontier evaluations and reservoir studies. Since that time, he has evaluated reserves and resources in more than 40 countries. Leonard is a skilled provider of reserves and resource opinions, corporate evaluations, economic models, reservoir advisory services and resource supply studies and has developed and delivered training programs for reservoir evaluation teams. He has offered expert witness testimony on pipeline tolls, economic damages and land valuation. Leonard is also responsible for the firm’s commodity market analyses and price forecasting.
Trisha MacDonald
P. Eng.
Vice President
Trisha joined GLJ in 2004. Early in Trisha’s tenure at GLJ, she began to specialize in tight gas evaluations and resource studies throughout northeastern BC and northwestern Alberta, specifically the exploration and development plays of the Montney oil, gas and liquid rich gas pools. Since 2012, her scope has evolved to include international reservoir studies and evaluations, as well as Canadian heavy oil and in situ reservoir evaluations. In 2020, Trisha became the Senior Manager of Engineering. In this role, she has led multi-disciplinary teams while working with GLJ’s clients to elevate their businesses in many areas, such as integrated studies, prospect analysis, CCUS and EOR project and reserves evaluations. Trisha also teaches courses internally at GLJ and externally for industry, government and post secondary institutions.
Patrick A. Olenick
P. Eng.
Vice President, International Evaluations
Patrick joined GLJ in 2003 and is responsible for international and Canadian frontier reserves, resources and economic evaluations. His experience also includes secondary and tertiary enhanced oil recovery schemes. Since joining GLJ’s international evaluations group, he has provided reserves and resources evaluations for oil and gas basins in more than 15 countries across the globe. Patrick is well versed in probabilistic and risk analysis, with significant experience in the evaluation of exploration prospects and associated portfolios.
Greg Owen
P. Eng.
Vice President, New Ventures & Technical Services
Greg joined GLJ full-time in 2019 and brings more than 24 years of experience in upstream and midstream oil and gas. After coming on board as a consultant in 2016, Greg is now responsible for new product business development, both nationally and internationally. His extensive experience includes work in operations, projects and development in offshore and steam-assisted gravity drainage (SAGD). At GLJ, Greg brings a focus on strategy, development planning, acquisitions and divestitures and operational excellence.
Colleen Sherry
MSC, MBA, MSL
Vice President, Sustainability & Emissions Management
Colleen Sherry is the current and inaugural Vice President, Sustainability & Emissions Management, at GLJ. Colleen supports GLJ’s expanding strategic advisory capacity in decarbonization, energy transition, ESG reporting, responsible production certification, and emerging technologies. Colleen is a sustainability, geotechnical and business strategy specialist with more than 25 years of operational and leadership experience, largely in the energy and natural resource extraction sectors. Her expertise has supported client sustainability strategy assessment and development in numerous jurisdictions worldwide.
Graham P. Simpson
Ph.D., P. Geo.
Vice President, Geosciences
Dr. Simpson joined GLJ in 2012 and has over 30 years of experience in the energy industry. Graham is responsible for the Geosciences department which works on a diverse range of international and domestic energy projects including oil and gas, carbon sequestration, geothermal and helium. Graham’s technical expertise is on evaluations of stratigraphically and structurally complex fields. In addition, Graham develops and presents courses on a variety of subjects for GLJ, universities and clients. These subjects include: geology and the energy industry for non-geologists, geology in reserves analysis, core interpretation workshops, prospect analysis – risk and uncertainty, integrating geology and engineering in reserves analysis and advanced geological training. Graham’s academic background is in aqueous geochemistry and acid gas and over the last five years has been heavily involved in carbon capture and sequestration modelling and evaluation.
Alan Withey
CPA, CFP
CFO
Alan has 30 years of experience as a finance executive with an extensive history in the energy industry. Alan is skilled in negotiation, minerals, and contract management. He also specializes in strategic management, budgeting, business risks, growth, and planning all with capable execution in mind. Alan joined GLJ in October as Chief Financial Officer and Corporate Secretary, where he oversees finance, accounting, business support, financial planning, financial analysis, and treasury functions. Alan is a Chartered Professional Accountant and a Certified Financial Planner and holds a Bachelor of Commerce degree from the University of Calgary.
Kelly Zukowski
P.Eng.
Vice President
Kelly joined GLJ in 2003, and has more than 19 years of experience in the energy industry. In oil and gas, he has extensive experience in reserves and resources appraisals and economic evaluations used in corporate governance, regulatory filings, disclosure, financing, and asset transactions. Kelly specializes in unconventional resources with a specific focus on the Montney. Recently, Kelly assisted our clients with CCUS/CCS reservoir screening studies and project proposals for carbon sequestration hubs.
Indigenous Commitment Statement
Community Involvement
Our commitment to our community runs deep.
Our team has always been active in our community through both individual and corporate giving and volunteering efforts. Annually, GLJ donates to over 50 local charitable organizations, including medical groups, social aid agencies, amateur sports organizations and professional groups.
Professional Organizations
At an organizational level, our contribution includes advocating for professional groups within the energy industry.
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