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Jonathan Ellis

Jonathan Ellis

Secretariat60 Robinson RoadBEA building #14-01SingaporeSingapore068892

Global Leader

WWL Ranking: Global Elite Thought Leader

WWL says

Jonathan Ellis is “a superior expert” who is held in high esteem by sources, one of whom says, “His judgement, experience and confidence have impressed me.”


Jonathan Ellis is a Managing Director with Secretariat and is based in Singapore. He has had broad forensics, litigation and arbitration experience over the past 15 years. He specialises in the quantification of damages and valuations, in particular in dispute contexts, for litigation, arbitration and expert determination purposes.

Jonathan has worked on matters before the UK and Singapore High Courts as well as in ad hoc, SIAC, LCIA, ICC, HKIAC, UNCITRAL and ICSID arbitration forums. He has provided oral testimony on a number of occasions, in both court and arbitration, and has been engaged as a tribunal appointed expert.

Jonathan has provided advice and support in a variety of situations, including disputes, M&A transactions, corporate restructuring, financial reporting and expert determination. His advice encompasses a number of sectors including, energy, power, pharmaceutical, mining and manufacturing. His experience also includes providing consulting advice to two utility suppliers in the Middle East, in respect of both water and power. Additionally, he has experience of conducting independent accounting investigations and reviews.

Jonathan is a physics graduate of Imperial College London and has a master's degree in accounting and management science, with distinction, from the University of Southampton. He is a fellow of the Institute of Chartered Accountants in England and Wales (ICAEW), where he was previously the vice chairman of the energy and natural resources special interest group, and he is also a current member of the valuation and forensic groups. Additionally, he is a member of the Association of International Petroleum Negotiators (AIPN).

Since 2017 Jonathan has been recognised among the leading arbitration expert witnesses worldwide by Who's Who Legal and was classified as “Global Elite Thought Leader” for 2020: “the "superb" Jonathan Ellis is one of the most highly rated valuation experts in Asia” (2017), he has “wide-ranging accountancy experience and "works seamlessly with the legal and client teams”" (2019) and is "‘a superior expert’ who is held in high esteem by sources“ (2020).

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