National Grid ESO's Executive Team

On this page you can meet the ESO’s Executive Team.

Led by the Executive Director, the ESO Executive Team has overall responsibility for the ESO and the delivery of a safe, efficient and reliable electricity network.

Fintan Slye National Grid ESO

Fintan Slye, Executive Director

Fintan joined National Grid ESO in 2018. Prior to that he was Chief Executive of the EirGrid Group, the electricity system and market operator in Ireland and Northern Ireland.  He previously also worked for McKinsey (2006-2008) in Ireland and UK and ESB (1994 – 2006) in Ireland, Europe and the US. 

Fintan holds Master’s degrees in engineering and Business Administration along with diplomas in legal studies and European Law.

Isabelle Haigh, National Grid ESO

Isabelle Haigh, Head of National Control

Isabelle joined ESO in March 2021 from Gas Transmission where she was heading up the operational field force. She graduated in Electrical and Electronic Engineering and has had 30 years working in the industry for National Grid. Previous roles have included; being the first female engineer in the Birmingham Grid Centre, designing voltage management schemes, designing and managing balancing services and leading large transformation projects such as the development of the Transmission Network Control Centre, and a fixing the basics programme in Gas Transmission.

Julian Leslie, Head of Networks and ESO Chief Engineer

Julian has had almost 30 years’ experience in electricity system operation for National Grid. This included 4 years working in National Grid US developing a new system operator function for a large part of the Mid-West of America. Julian has a degree in Electrical Engineering, is a Chartered Electrical Engineer and a Fellow Member of the Institute of Engineering and Technology.

Kayte oNeil

Kayte O’Neill, Head of Markets

Kayte joined ESO in 2018 and prior to her current role as Head of Markets led the Strategy and Regulation team where she was accountable for delivering the RIIO2 price control. She has held a wide variety of senior roles across the business, including three years in Boston with National Grid’s US electricity distribution businesses. Kayte holds a first-class degree in Business Economics and is a graduate of the Harvard Business School Program for Leadership Development. She is a Director on the ESO Board and a Non-executive Director on the Regen Board.

Matthew Wright

Matthew Wright, Head of Strategy and Regulation

Matthew has over 30 years of experience in the utilities sector, most recently as Managing Director of Ørsted in the UK. He has also served as CEO of Southern Water and EVP of Power Delivery at US electric utility PacifiCorp. He is a Board member of POWERful Women, a professional initiative to advance gender diversity within the energy sector.

Norma Dove-Edwin

Norma Dove-Edwin, ESO CIO

Prior to joining the ESO in November 2020, Norma was Group Chief Information and Data Officer at Places for People, where she led their digital transformation. Norma spent nine years at British American Tobacco where she held a series of executive roles. She has an MBA from Imperial College, London. 

Huma Ali

Huma Ali, Head of HR

Huma joined the ESO in 2015 having previously worked in a variety of HR roles across National Grid Group and its predecessors. She holds a degree in Business Management and is Chartered status with the Institute of Personnel and Development.

Gregg Smith

Gregg Smith, ESO CFO

Gregg joined National Grid ESO in 2020 after 21 years with IMI plc. Gregg holds a degree in Business Economics and is a qualified Chartered Management Accountant (ACMA and CGMA). Gregg held several global roles across all three IMI divisions throughout his career and has worked in the US, Spain and Switzerland.

Jonny Gallagher

Jonny Gallagher, Head of Corporate Affairs (Interim)

Jonny has been with National Grid for 5 years, working across regulation, strategy, business development and public affairs. Prior to joining National Grid, Jonny worked in the Civil Service. He holds a degree in History and Politics.

Zoe Morrisey

Zoe Morrisey, ESO Legal Counsel and Company Secretary

Zoe joined National Grid in 2012 and has worked across the various UK business units advising on a range of regulatory and commercial matters. Prior to joining National Grid Zoe worked for Ofwat and in private practice in the competition and procurement team having qualified to practice as a solicitor in 2008. Zoe has a degree in Law with German as well as two postgraduate diplomas in competition law and economics for competition law.