Our Experts

John Hansen

Partner

Highlights

CPA, CLP, CGMA and CFF.
More than 200 expert appointments.
Proven as a credible expert witness under cross-examination in litigation and arbitration.
Specialises in intellectual property infringement and misappropriation.
Recognised as a leading testifying expert on intellectual property by Intellectual Asset Management Magazine (IAM).

Services

Industries

Financial Services | Healthcare & Life Sciences | Industrial & Manufacturing | Sports & Entertainment | Technology, Media & Telecoms

Clients and industry peers describe John Hansen as “fantastic, thorough and very involved” and note that “he knows the testimony, documents and where the strengths and weaknesses are on the matter”, reflecting a deeply experienced intellectual property damages practice. His work covers the financial impact of alleged infringement and misappropriation, including lost profits, reasonable royalties, unjust enrichment and diminution in business value, across industries such as technology, entertainment, sports, construction and finance, with experience in disputes exceeding US$1 billion.
Lexology Index - IP - Thought Leader

Expertise

John L Hansen is a Certified Public Accountant with more than 35 years of experience. He has been appointed as an expert on hundreds of occasions.

John has testified as an expert on damages and economic issues in trial and arbitration, state courts, federal courts, and before the International Trade Commission. He has presented declarations and deposition testimony before the Patent Trial and Appeal Board and participated in settlement negotiations and mediations for disputed values in excess of $1 billion.

John specialises in evaluating the financial impact of alleged intellectual property infringement and misappropriation, including patents, trademarks, copyrights, and trade secrets. He has assisted clients with Section 337 investigations before the United States International Trade Commission, addressing domestic industry and remedy issues. He has also consulted on the valuation and licensing of intellectual property.

John has extensive experience in class action matters, including assessing issues related to class certification and evaluating class-wide damages models. He has created databases to evaluate risk exposure and identify potential class members, dissimilarities among potential class members and evaluation of class representatives. John has determined whether damages may be calculated on a class-wide basis and evaluated potential class damages, including economic offsets to potential damages.

Professional recognition

IAM

IAM recommended expert witness

Lexology Index

Client Choice – IP
IP – Thought Leader

John is incredibly thorough, knowledgeable, diligent and very hard-working. He is calm under pressure during deposition. He stands out for his intelligence, strong analytical skills, self-sufficiency, and creativity.
Lexology Index - Client Choice - IP

Background

John is an experienced consultant who supports companies on economic, accounting, and damages matters in a wide variety of industries, from entertainment and sports to technology, software, and consumer products. He has analysed and addressed lost profits, price erosion, reasonable royalties, unjust enrichment, increased costs, and diminution of asset and business value. John’s experience spans intellectual property, commercial damages, class action, forensic accounting, and valuation matters.

John has been recognized as a leading expert witness in intellectual property disputes in the United States in the IAM Patent 1000 since 2018 and was recognized as a Top 25 Patent Damages Expert in 2026 by the CPVA designation. He is a Certified Licensing Professional, a Chartered Global Management Accountant, and is Certified in Financial Forensics by the American Institute of Certified Public Accountants (AICPA). John has presented on financial, accounting and damages issues, along with intellectual property valuation and licensing, to university and industry groups such as the Licensing Executives Society, the University of California College of the Law, San Francisco, Stanford University, and Santa Clara University, and the USC Gould School of Law Intellectual Property Institute.