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.

Mr. Ellis 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.

Mr. Ellis 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.

Mr. Ellis 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 Mr. Ellis has been recognized among the leading arbitration expert witnesses worldwide by Who’s Who Legal, most recently classified as: “Thought Leaders Global Elite – Arbitration Expert Witnesses 2022”, “Global Leader – Experts – Financial Advisory and Valuation – Quantum of Damages 2021”, and “National Leader Southeast Asia – Arbitration Expert Witnesses 2021”.

According to Who’s Who Legal:
The “excellent” Jonathan Ellis is “an experienced testifying expert in international arbitration matters”. He is “charming, calm and collected” and “very good at expressing himself, both verbally and in writing”.
Jonathan Ellis is “highly rated” throughout the market as a go-to economic damages expert. His extensive experience in disputes includes litigation and arbitral proceedings.
Jonathan Ellis is renowned for his first-rate expert practice which sees him regularly testify on quantification of damages and valuations under a variety of institutional rules.

Education

• BSc, Physics, Imperial College London
• MSc, Accounting and Management Science (Distinction), University of Southampton

Professional Associations

• Fellow of the Institute of Chartered Accountants in England and Wales(ICAEW)
• Member of the Valuation and Forensic Groups of the ICAEW
• Association of International Petroleum Negotiators (AIPN)