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Our Team

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A diverse and dynamic leadership team backed by industry expertise.

Topaz is led by a strong, creative management team that draws from its unique industry experience to create a modern hybrid company focused on growth, sustainability and delivering strong financial performance.

Executive Officers

  • Marty Staples

    President & CEO

    Marty Staples has over 19 years in the oil and gas industry in the areas of management, business development, exploration, land and evaluations. Mr. Staples played an integral role in the growth and development of Tourmaline Oil Corp. since 2010, which includes the execution of cumulative asset and corporate acquisitions of $3.7 billion. Mr. Staples previously held positions at both private and public companies. Mr. Staples holds a Bachelor’s degree in Commerce from the Haskayne School of Business at the University of Calgary.

  • Cheree Stephenson

    VP Finance & CFO

    Cheree Stephenson has over 19 years in the oil and gas industry in the areas of executive leadership, corporate finance and public company financial reporting. Most recently, Ms. Stephenson was instrumental in the start-up and growth of Petrus Resources Ltd. where she held the role of Vice President, Finance and Chief Financial Officer since its inception in 2010. Previously, she served as Controller at Peyto Exploration & Development Corp. Ms. Stephenson is a Chartered Professional Accountant (CPA, CA) and holds a Bachelor’s degree in Commerce from the Haskayne School of Business at the University of Calgary.

Board of Directors

  • Mike Rose

    Mr. Rose's principal occupation is the Chairman, President and Chief Executive Officer of Tourmaline since he founded the Company in August 2008. Prior thereto, he was Chairman, President and Chief Executive Officer of Duvernay, a publicly traded oil and gas company (2004- 2008). Mr. Rose has held various exploration and production positions, including managing exploration and petroleum engineering research for a large exploration and production company before founding Berkley in 1993. After the sale of Berkley in 2001, Mr. Rose founded Duvernay, which was sold in August 2008. Mr. Rose was educated at Queen's University, graduating with an honours degree in Geology. Mr. Rose is a member of the Association of Professional Engineers and Geoscientists of Alberta and the Canadian Society of Petroleum Geologists. Among other awards, Mr. Rose is the recipient of the Stanley Slipper Gold Medal from the Canadian Society of Petroleum Geologists (2009). Mr. Rose has over 40 years of experience in the oil and gas industry.

  • Tanya Causgrove

    Ms. Causgrove's principal occupation is Chief Financial Officer and Managing Director of ARC Financial. Ms. Causgrove is a member of ARC Financial's Executive Committee. Ms. Causgrove leads ARC Financial's finance, accounting, tax, human resources, regulatory, technology and administrative functions and works closely with the investment team and investors. Ms. Causgrove currently represents ARC Financial on the board of Citadel Drilling Ltd. and holds a Bachelor of Commerce in Accounting from the University of Alberta, is a Chartered Professional Accountant (CPA, CA) and is a CFA Charterholder. Ms. Causgrove has more than 24 years of management experience in the energy industry.

  • Jim Davidson

    Mr. Davidson's principal occupation is a Corporate Director. Mr. Davidson is a director of ATB Financial, the Business Council of Alberta, the Creative Destruction Lab, the Economic Futures Council of Junior Achievement, the Fraser Institute and the Modern Miracle Network. Mr. Davidson was most recently Deputy Chairman of GMP FirstEnergy. Mr. Davidson co-founded FirstEnergy Capital Corp. in 1993. Mr. Davidson has more than 40 years of experience in the financial services industry.

  • John Gordon

    Mr. Gordon's principal occupation is a Corporate Director. Mr. Gordon served as the Canadian Managing Partner, Quality and Risk Management, the Canadian Managing Partner, Audit and the Calgary Office Managing Partner for KPMG LLP prior to his retirement in 2018. Mr. Gordon has extensive experience in providing audit and other services to public oil and gas companies. Mr. Gordon is a Chartered Professional Accountant (FCPA), a Chartered Financial Analyst (CFA), and is a graduate of the University of Saskatchewan. Mr. Gordon serves on the Board of the CAMH Foundation, the Alberta Adolescent Recovery Centre, and is a lecturer for, and an active member of the Institute of Corporate Directors. Mr. Gordon has more than 30 years of experience in a variety of industries, including the energy sector.

  • Darlene Harris

    Ms. Harris' principal occupation is a Corporate Director. Ms. Harris is a director and Chair of the Audit Finance Committee of the Spark Credit Union. Previously, Ms. Harris spent 32 years with Shell Canada, most recently as Senior Manager of M&A and Corporate Finance as well as Co-Chairman of the Shell Canada Pension Plan. Ms. Harris has a broad range of experience in strategic acquisitions and divestment, financial markets, banking, pension management and governance, talent management and directorship. Ms. Harris is a Chartered Professional Accountant (CPA, CMA).

  • Steve Larke

    Mr. Larke's principal occupation is a Corporate Director. Mr. Larke is a director of Vermilion Energy Inc. and Headwater Exploration Inc. Mr. Larke's previous roles include Operating Partner and Advisory Board member with Azimuth Capital Management Inc., an energy-focused private equity fund based in Calgary, Alberta. Prior to joining Azimuth Capital Management Inc., Mr. Larke was Managing Director and Executive Committee member with Calgary-based Peters & Co. from 2005 to 2015, and prior thereto, was Vice-President and Director with TD Newcrest from 1997 to 2005. Both at Peters & Co. and TD Newcrest, Mr. Larke received leading rankings in the Brendan Wood International survey of institutional investors. Mr. Larke has a Bachelor of Commerce degree (with distinction) from the University of Calgary and has earned the Chartered Financial Analyst (CFA) and Institute of Corporate Directors (ICD.D) designations. In addition, Mr. Larke is a Fundamentals of Sustainability Accounting (FSA) Credential Holder. Mr. Larke has over 20 years of experience in energy capital markets, including research, sales, trading and equity finance.

  • Brian Robinson

    Mr. Robinson's principal occupation is a director and Vice President, Finance and Chief Financial Officer of Tourmaline. Prior thereto, Mr. Robinson was Vice President, Finance and Chief Financial Officer of Duvernay and prior to that was Vice President, Finance and Chief Financial Officer of Berkley. Previously, Mr. Robinson held numerous positions in finance and accounting with intermediate and senior oil and gas companies, commencing his career with a large public accounting firm. Mr. Robinson is also a trustee of Boardwalk Real Estate Investment Trust, a publicly-traded real estate investment trust on the TSX. Mr. Robinson holds a Bachelor of Commerce degree from the University of Calgary and is a Chartered Accountant. Mr. Robinson has over 40 years of experience in the oil and gas industry in the disciplines of finance, financial reporting, budgeting, accounting, management, treasury, tax, and business development.

  • Rafi Tahmazian

    Mr. Tahmazian's principal occupation is Senior Portfolio Manager and Director with Canoe Financial. Mr. Tahmazian is also the lead portfolio manager for Canoe Energy Portfolio Class, Canoe Energy Income Portfolio Class, and Canoe Energy Alpha LP. Mr. Tahmazian is an award-winning portfolio manager. Prior to Canoe, Mr. Tahmazian spent 13 years at First Energy Capital, a leading investment dealer that focused on the energy industry. He left the firm in 2008 as Vice Chairman and Managing Director. He is currently on the board of directors for Artis Exploration Ltd, Aureus Energy Services Inc., Well Ventures Corp., Chance Oil and Gas Ltd., and Alberta Teachers Retirement Fund. Mr. Tahmazian holds a Bachelor of 127 Economics degree from the University of Calgary. Mr. Tahmazian has more than 29 years of management experience in the energy industry.