Our extensive network includes top experts from academia and industry.

Featured Expert

Ronnie Barnes

Vice President

Our extensive network includes top experts from academia and industry.

Ronnie Barnes heads Cornerstone Research’s international arbitration and litigation practice. He also coheads the firm’s valuation, M&A, and bankruptcy practice.

Dr. Barnes is an expert in accounting, damages, and valuation. He specializes in cases that raise complex valuation issues, including the estimation of the cost of capital, the determination of country risk premia, and the valuation of complex financial instruments such as derivatives and structured finance products. Who’s Who Legal has recognized Dr. Barnes as a leading expert witness in legal arbitration and a Global Leader in assessing the quantum of damages in the financial advisory and valuation field.

Dr. Barnes has provided written and oral testimony in a number of litigation and arbitration matters in the United Kingdom, United States, Canada, South Africa, and internationally. He has addressed such topics as the tax treatment of hire purchase contracts; the quantum of damages in commercial disputes; the economic equivalence of different financial derivatives; the cost of capital in the contexts of a competition enquiry and valuation disputes; the use of derivatives in alleged share price manipulation; and stock market efficiency in shareholder actions.

In addition to serving as a testifying expert, Dr. Barnes leads teams that support academic and practitioner experts. In this capacity, he has worked on numerous matters related to financial institutions and financial products. He has addressed issues related to the analysis of damages stemming from alleged misrepresentations and omissions in corporate disclosures, as well as other matters requiring sophisticated accounting, financial, and/or economic analysis.

Dr. Barnes has published research on a range of topics, notably cross-border valuation, valuation methodologies, damages, and the role of economic and econometric analyses in damages assessments. He has authored or coauthored multiple articles, as well as chapters in leading reference books on international arbitration.

A UK-qualified chartered accountant, Dr. Barnes previously held positions in accounting and investment banking firms, as well as a consulting firm and academia. He has more than a decade of experience teaching courses in corporate finance, accounting, and valuation, among other topics.

International Arbitration and Litigation Capabilities

Cornerstone Research has worked with experts providing trial testimony in foreign venues, adapting our services to the standards and protocols of the different jurisdictions. For example, we applied our experience with finance and securities markets to address the issues in the first case to reach trial under Ireland’s Companies Act. In other trials, we have analyzed accounting, tax, and economic issues arising in breach of contract and intellectual property contexts.

We have consulted to attorneys involved in matters pending in major arbitral venues. We apply our expertise in finance, economics, accounting, and regulation to address complex international business issues. Our clients have included firms in the financial and professional services, energy, high-technology and consumer goods, as well as public-sector entities.

Featured Cases

Featured Publications

8 February 2024

GAR Live: Damages 2024

Ronnie Barnes will join arbitrators and attorneys in a live Q&A session at this Global Arbitration Review conference in London.

18 January 2024

Cartels Workshop: An Advanced Seminar on Substantive and Procedural EU Developments

Gregor Langus will speak on a panel titled ‘Substantive Issues’ at this annual workshop in Brussels.

30 November 2023

GAR Academy Damages in International Arbitration

Ronnie Barnes serves as a faculty member in GAR Academy’s Damages in International Arbitration Massive Open Online Course (MOOC).

28 November 2023

Washington Arbitration Week 2023

Sveta Ksenofontova will discuss “The Impact of Global Price Volatility on Calculating Damages in International Arbitration” at this Washington, DC ...

17 November 2023

Dublin International Arbitration Day 2023

Ronnie Barnes will moderate a panel titled, ‘Arbitration, Bankruptcy & Sanctions,’ at this annual conference in Ireland.

18 August 2023

Counterfactual Models: A Key Tool in Energy Price Disputes

This article discuss methodological considerations in selecting an appropriate model to estimate counterfactual prices in energy markets.

14 March 2023

Gregor Langus Joins Cornerstone Research

Leading competition expert expands the firm’s European capabilities.

18 January 2023

WWL: Arbitration Expert Witnesses 2023

Ronnie Barnes of Cornerstone Research and René Stulz of The Ohio State University are again named to expert witness list.

9 June 2022

WWL: Arbitration Expert Witnesses 2022

Ronnie Barnes of Cornerstone Research and Rene Stulz of the Ohio State University have been named to this annual list of 'world-leading' arbitratio...

29 January 2021

ICC Arbitration Involving Commercially Reasonable Efforts to Develop and Commercialize a Drug

An ICC arbitration tribunal determined that the claimant did not materially breach its license agreement with the respondent, leaving the agreement...

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