Our extensive network includes top experts from academia and industry.
Our extensive network includes top experts from academia and industry.
Ronnie Barnes
Vice President
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.
Our extensive network includes top experts from academia and industry.
René M. Stulz
Everett D. Reese Chair of Banking and Monetary Economics,
Director, Dice Center for Research in Financial Economics,
Fisher College of Business,
The Ohio State University
René Stulz is a leading finance expert, whose work focuses on corporate finance, risk management, derivatives, securities, financial institutions, and valuation. Professor Stulz has provided expert testimony in U.S. federal and state courts, U.S. and international arbitrations, the London High Court of Justice, and the Federal Court of Australia.
Professor Stulz’s findings have provided the foundation for favorable rulings in motion practice and on damages. His expert testimony played a key role in class certification and summary judgment in a number of high-profile matters, including In re BP p.l.c. Securities Litigation and In re Moody’s Corporation Securities Litigation.
He has testified in many securities class actions, as well as matters related to mortgage-backed securities and collateralized debt obligations (CDOs), bankruptcy, derivatives, cross-border transactions, alleged state discriminatory practices against investors, hedge fund and pension fund management, fixed-income securities, insurance contracts, taxes, and breach of contract allegations.
Professor Stulz was president of the American Finance Association, edited the Journal of Finance, and co-edited the Journal of Financial Economics. He wrote the textbook Risk Management and Derivatives, has edited several books, and has published more than one hundred papers in finance and economics journals. The Journal of Applied Corporate Finance dedicated its winter 2022 issue to Professor Stulz’s research, republishing his notable articles on globalization, corporate finance, and risk management.
Thomson Reuters includes Professor Stulz in its list of the world’s most influential scientific minds. He is one of the most highly cited scholars in financial economics. Lexology Index (formerly Who’s Who Legal) has recognized Professor Stulz as a leading expert witness in legal arbitration and a recommended consulting expert in assessing the quantum of damages in the financial advisory and valuation field.
Professor Stulz is a bank director and a trustee of the Global Association of Risk Professionals. He has consulted for the International Monetary Fund, the World Bank, the New York Stock Exchange, the Federal Reserve Bank of New York, and various corporations and law firms. Professor Stulz is also a research associate of the National Bureau of Economic Research (NBER) and a fellow of the European Corporate Governance Institute. At the NBER, he directs the research group on the risks of financial institutions.
Our extensive network includes top experts from academia and industry.
Gary J. Levin
Former Risk and Financial Advisory Partner,
Forensic Practice,
Deloitte Financial Advisory Services LLP
Gary Levin is an accounting and auditing expert with over four decades of experience in financial statement audits, litigation and disputes, corporate investigations, and consulting. Mr. Levin is a certified public accountant (CPA) whose expertise includes matters involving U.S. Generally Accepted Accounting Principles (GAAP) and U.S. Generally Accepted Auditing Standards (GAAS). He has submitted expert reports on various issues and testified in numerous depositions, trials, and arbitrations.
In litigation and other disputes, Mr. Levin has been retained as an expert witness to address accounting irregularities, accountant liability, damages, and due diligence issues. He has provided expert testimony in matters involving revenue recognition, percentage of completion accounting, the value of inventory and associated reserves, intangible assets, goodwill, stock options, and accounting for subsequent events, among others.
In addition, Mr. Levin has consulted on accounting and audit arbitrations in over 150 purchase price disputes, addressing accounting treatment and disputes related to working capital and earn-out provisions. In these matters, he has often served as arbitrator or mediator. Mr. Levin has also conducted forensic investigations focused on alleged asset misappropriation, channel stuffing, manipulation of accounting records, insider trading, and executive and corporate fraud.
For fifteen years, Mr. Levin led Deloitte’s Litigation and Dispute Practice and served as a financial advisory services partner in the firm. Previously, he was an audit partner at Arthur Andersen and Deloitte, leading over 500 audits of private and public companies and serving in the audit practice for almost twenty-five years. Mr. Levin’s industry expertise includes automotive, broadcasting, manufacturing, professional services, retail, and wholesale distribution.
Our extensive network includes top experts from academia and industry.
Sveta Ksenofontova
Senior Economist
Sveta Ksenofontova specializes in financial analysis, valuation, and damages assessments in complex business litigation and international arbitration. Ms. Ksenofontova has extensive experience as an expert witness in international arbitration venues. She has provided testimony, including under cross examination, in the London Court of International Arbitration (LCIA), the International Chamber of Commerce (ICC), the Permanent Court of Arbitration (PCA), and the International Centre for Settlement of Investment Disputes (ICSID). She has submitted numerous expert reports under ICSID, PCA, ICC, and Swiss Chambers’ Arbitration Institution rules.
Ms. Ksenofontova has worked on multiple investor-state and commercial arbitration disputes, consulting on issues related to economic feasibility, market conditions, corporate governance, and quantum of damages in a variety of contexts. Her industry expertise includes commodities (agricultural, certain chemicals, paper and packaging, oilfield services), consumer goods, energy, engineering and construction, industrials (multi-industry, heavy machinery, auto and auto suppliers, aerospace and defense, waste), infrastructure (toll roads, airports), media, mining, real estate, and transportation (airlines, rail, and road).
Ms. Ksenofontova’s experience includes:
Investor-state treaties
- As a Tribunal-appointed expert, testified and provided an expert opinion, financial analysis, and expert consultation regarding the valuation of a major international container port in LCIA proceedings in DP World and Doraleh v. Djibouti.
- Provided an expert opinion and testified at the PCA hearing in Al-Tuwairqi v. Pakistan. Assessed economic feasibility of a steel producer given its cost structure and position on the global and regional cost curves. Quantified the value of damages arising from an alleged breach of investment treaty by the state. Acted for the respondent.
- Provided an expert opinion and testimony on quantifying losses involving a tobacco distributor in an ICSID case, Gustavo Maeso Lando v. Venezuela. Acted for the respondent.
Commercial arbitration
- In a shareholder international arbitration dispute under ICC rules, provided an expert opinion and testified before the Tribunal on the merits of a third-party expert’s enterprise valuation of a media company. In the final court ruling, all claims by Ms. Ksenofontova’s client were granted in full, and all claims of the opposing side were rejected in full.
- Served as testifying expert witness for the claimant in a Baltics arbitration dispute in a multibillion-dollar valuation involving multiple retail and real estate business valuations. Ksenofontova’s valuation matched the contemporaneous internal valuation prepared by the respondent’s board of directors, which was discovered during a later document production stage.
- Prepared expert reports on damages in a sports matter alleging media piracy in the Arabian Gulf.
Before joining Cornerstone Research, Ms. Ksenofontova worked on valuation and damages matters at economics and management consulting firms, where she supported clients involved in international arbitration and investor-state disputes. Previously, she spent nearly two decades as a portfolio manager, equity analyst, and fixed income and derivatives trader at leading asset managers and global investment banks.
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
Selected Professionals
Our staff consultants contribute expertise in economics, finance, accounting, and marketing, as well as business acumen, familiarity with the litigation process, and a commitment to provide outstanding support.
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Ronnie Barnes
Ronnie Barnes
Vice President
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Tuba Toru Delibasi
Tuba Toru Delibasi
Senior Manager
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Sveta Ksenofontova
Sveta Ksenofontova
Senior Economist
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Gregor Langus
Gregor Langus
Vice President*
Featured Publications
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