Shelf Drilling Management Team brings international experience across all sectors of the oil & gas industry.

Management

  • Greg O’Brien

    Chief Executive Officer

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    Greg O’Brien

    Chief Executive Officer

    Mr. O’Brien was appointed Chief Executive Officer in August 2024 and has spent his entire career in the oil and gas sector. Prior to his current role, Mr. O’Brien served as the Company’s Executive Vice President & Chief Financial Officer since 2016. He has also previously served as Director, Strategic Planning in charge of Shelf Drilling’s corporate development efforts. Mr. O’Brien joined Shelf Drilling from Lime Rock Partners, where he focused on oilfield services and exploration & production investment opportunities internationally. Before that, he held energy investment banking roles with J.P. Morgan and SunTrust Robinson Humphrey. Mr. O’Brien graduated from the McIntire School of Commerce at the University of Virginia.

  • Kurt Hoffman

    Executive Vice President & Chief Operating Officer

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    Kurt Hoffman

    Executive Vice President & Chief Operating Officer

    Kurt Hoffman is Chief Operating Officer of Shelf Drilling. Prior to joining Shelf Drilling, Kurt was Senior Vice President and Chief Operating Officer of Seahawk Drilling, a Houston and Gulf of Mexico-based jack-up drilling provider where he was responsible for the company’s daily operations and strategic business plan implementation.

    Kurt spent 18 years at Noble Drilling where he held senior operational and executive roles, including Vice President of Worldwide Marketing, Vice President of Western Hemisphere Operations and President of Noble’s engineering services division Triton Engineering Services.

    Kurt received a B.Sc. degree from Southwest Texas State University.

  • Ian Clark

    Executive Vice President

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    Ian Clark

    Executive Vice President

    Ian Clark is Executive Vice President of Shelf Drilling, with responsibility for human resources, information technology, supply chain and strategic roles including overseeing the plan for independence from Transocean. Prior to joining Shelf Drilling, Ian spent over 12 years with Transocean where he most recently served as Vice President of Human Resources. Previous roles included Division Manager for Transocean’s operations in North East Asia and also Managing Director for Nigeria.

    Before Transocean, Ian enjoyed a 20-year career with Schlumberger in various management, technical and human resources roles across Europe and Africa.

    Ian has a B.Sc. degree in Electrical and Electronic Engineering from Heriot Watt University in Edinburgh, Scotland and completed the Advanced Management Program at Harvard Business School.

  • Douglas Stewart

    Executive Vice President & Chief Financial Officer

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    Douglas Stewart

    Executive Vice President & Chief Financial Officer

    Douglas Stewart was appointed as Chief Financial Officer (CFO) of Shelf Drilling in July 2024. With extensive experience in the oil and gas industry across the US and the Middle East, he has held senior finance and legal roles, including CFO and General Counsel at Vantage Drilling, and Executive VP at Stallion Oilfield Holdings. He began his career specializing in corporate finance and securities law at a top-tier firm. Douglas holds a BA in Economics and International Studies from Trinity University and a Doctor of Jurisprudence from the University of Texas School of Law.

  • Michael Mezzina

    Vice President and Controller

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    Michael Mezzina

    Vice President and Controller

    Michael Mezzina is Vice President and Controller at Shelf Drilling. Prior to joining Shelf Drilling, Michael most recently held the role of Global Finance Director at Transocean, financially overseeing the worldwide operations of the company.

    Michael has a wide range of accounting and finance experience. In his over 18 years at Transocean, Michael served in different capacities of increasing responsibilities. He lead in positions of Division Controller, Business Unit Controller and Director of Accounting, Corporate, with postings in West Africa, Europe, Egypt and the United States.

    Michael holds a Master’s degree in Finance from the Normandy Business School in France.

  • Michael Shimmin

    Vice President, Tax

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    Michael Shimmin

    Vice President, Tax

    Michael Shimmin is the Vice President of Tax at Shelf Drilling and is responsible for global taxation at the company.

    Michael began his career in 2006 as an international tax consultant with Deloitte and has since gained extensive international tax experience with several multinational companies. Michael joined Shelf Drilling in 2013 and has held various positions within the company’s tax function.

    Michael’s expertise includes global tax planning, U.S. GAAP income tax accounting and reporting, global tax compliance, tax audit defense, transfer pricing, M&A tax due diligence, cash repatriation strategies, and complex tax research and modeling.

    Michael holds a bachelor’s degree in Finance from the University of Wisconsin and a Juris Doctor from Baylor University School of Law.

  • Rishi Srivastava

    Vice President, Technical Services

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    Rishi Srivastava

    Vice President, Technical Services

    Rishi Srivastava is Vice President of Technical Services at Shelf Drilling and is responsible for our worldwide Asset Management and Global Supply Chain. Rishi previously served as the Director of Technical Services at Shelf Drilling.

    He started his career as Trainee Engineer in 2004 and has since held various operational and technical positions in India, Brazil, Singapore, US and Malaysia at Transocean before joining Shelf Drilling in 2012.

    Rishi holds a B. Tech. in Chemical Engineering from the Indian Institute of Technology, Kanpur and has completed the General Management Program at Harvard Business School.

  • Aaftaab Kharbanda

    Vice President, Operations & Projects

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    Aaftaab Kharbanda

    Vice President, Operations & Projects

    Aaftaab Kharbanda is the Vice President for Operations and Projects at Shelf Drilling and is responsible for our global operations and major capital projects.

    Aaftaab joined the offshore drilling industry as a Trainee Engineer with Transocean in 2007, and subsequently held various operations and project management roles in India, Singapore, Saudi Arabia and UAE. He has been with Shelf Drilling since the Company’s inception in 2012 and most recently served as the Vice President for Projects, leading the major capital projects group responsible for executing fleet reactivation, out-of-service and newbuild projects.

    Aaftaab holds an Undergraduate Degree in Civil Engineering and a Master’s Degree in Infrastructure and Project Management from the Indian Institute of Technology, Madras. He has completed the General Management Program at Harvard Business School, and is a certified Program Management Professional (PgMP).

  • Daniel Hoff

    Vice President, Human Resources and Communication

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    Daniel Hoff

    Vice President, Human Resources and Communication

    Daniel Hoff is the Vice President of Human Resources and Communication at Shelf Drilling. He joined Shelf Drilling in 2012 as HR Manager and most recently served as Director of Human Resources. Before joining Shelf Drilling, Daniel worked as HR Advisor in the Tax and Legal department of PricewaterhouseCoopers (PwC), serving a variety of industries.

    Daniel holds degrees in International Management Strategy, Business Administration, and HR Management from Universidade Nova de Lisboa and the University of Applied Sciences Cologne.