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Mary Quaney

Group Chief Executive Officer

Mary Quaney

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Mary Quaney

Group Chief Executive Officer

Mary was appointed Group Chief Executive Officer in August 2020. She joined Mainstream in 2009 and she held the role of Group Chief Financial Officer since 2017.

Mary has graduate and post-graduate qualifications from UCD and is a Fellow Chartered Accountant (FCA) and Chartered Tax Adviser (CTA). She is an advocate and spokesperson on gender diversity and participated was a mentor for the Global Wind Energy Council’s (GWEC) Women in Wind programme.

Prior to joining Mainstream, Mary held senior-level positions in finance and corporate tax in PricewaterhouseCoopers and Trinity Biotech Plc.

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Julie Berg

Chief Financial Officer

Julie Berg

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Julie Berg

Chief Financial Officer

Julie brings over 27 years of experience within finance and internal control and is an experienced leader with focus on promoting diversity in the workplace.

She has held the role as Audit Partner for several years, during which time she has supported many large, listed entities in Norway and has worked closely with Aker for many years.

Originally from the UK, she has extensive international experience within the energy and industrial sectors. Julie is a State Authorised Public Accountant.

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Bryan O’Shaughnessy

Group Chief Operating Officer

Bryan O’Shaughnessy

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Bryan O’Shaughnessy

Group Chief Operating Officer

Bryan was appointed Group COO of Mainstream in June 2024. He joined Mainstream in June, 2022 as COO for Latam and has over 30 years’ experience leading multinational energy projects. Prior to his arrival at Mainstream, he was Operations Director at Prime Energía. Given his background, he has a strong understanding of engineering disciplines, including mechanical, automation and electrical, with a methodical and structured approach to project engineering.

Bryan has a Bachelors degree in Engineering (honours) from University of Limerick.

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Birgitte Karlsen

General Counsel

Birgitte Karlsen

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Birgitte Karlsen

General Counsel

Birgitte was appointed General Counsel at Mainstream in October 2022 where she has responsibility for the legal and compliance functions across the Group.

She joined Mainstream from the position of General Counsel at Aker Offshore Wind following the company’s combination with Mainstream in August 2022.

She has worked in private practice within the energy sector for most of her career and since 2013 as a partner in the law firm Wikborg Rein.

Birgitte graduated with a law degree from the University of Bergen in 2002.

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