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Ciarán O' Brien

Partner | Head of Energy, Resources & Industrials

Ciarán leads Deloitte’s Energy, Resources & Industrials practice and is a partner in Audit & Assurance Department. 

Our Energy, Resources & Industrials practice serves clients across a number of sectors, including power and utilities; oil, gas and chemicals; industrial products and construction; and mining and metals.  Ciarán has extensive experience in the provision of assurance and advisory services to a range of companies including large listed, commercial state and multinational companies. He has substantial knowledge and expertise in the areas of ESG, complex transactions, regulatory reporting, internal controls, and IFRS. He previously led Deloitte’s Financial Reporting Advisory team and currently serves a portfolio of clients primarily in the Energy, Resources & Industrials sector.