Class Action Expert Witnesses

Class action expert witnesses and consultants listed here may be able to form expert opinions, draft expert witness reports, provide expert witness testimony at deposition and/or trial as or serve as consulting (non-testifying) experts on class action. The class action expert witness listings on this page are typically from fields/areas of expertise such as: Advertising, Business Damages, Economics, Insurance, Marketing, Software Engineering, Statistics, and Technology.

Eric Forister, PhD

Econ One Research, Inc.

Los Angeles, California
Economics, Business Damages - Damages, Lost Profit, Reasonable Royalty, False Advertising, Consumer Fraud, Class Certification, Class Action, Market Power, Market Definition, Patent, Survey, Valuation.
Dr. Eric Forister is an expert economist with testifying experience on market definition, market power, and damages. His expertise includes applying advanced statistical techniques to datasets, synthesizing information from documents, and designing and evaluating surveys. He focuses on relevant questions to tackle complex issues with an efficient and effective style of communication. Dr. Forister also has extensive experience consulting on issues including royalty rates, irreparable harm, sampling, survey design, common impact, and materiality. He is a Senior Economist at Econ One and can be reached for more information upon request. Learn more at

Michael Trousdale, PhD

Econ One Research

Los Angeles, California
Economics, Business Damages - Damages, Personal Injury, Wrongful Death, Medical Malpractice, Discrimination, Employment, Antitrust, Market Power, Market Definition, Class Action, Class Certification, Economic Analysis, Econometric Analysis, Economic Consulting
Dr. Michael Trousdale is a managing director at Econ One Research with over 15 years of experience conducting and managing complex economic research. As an economic expert, Dr. Trousdale applies economic and statistical analysis to liability and damages estimation for litigation matters. He has consulted on behalf of both plaintiffs and defendants across a wide array of industries and products, including professional sports, commercial real estate, steel products manufacturing, air & surface transportation, oil & gas, electricity, pharmaceuticals, radio equipment, and a variety of others.

Philip J. Cross, Ph.D.

Kenyon Consulting LLC

Washington, District Of Columbia
Economics, Statistics - Lost wages, Antitrust, Class action, Lost profits, Breach of contract, Damages, Liability, Survey design, Conjoint analysis, Big data, Machine learning, Privileged consulting, Discrimination, Wrongful termination, Wrongful death, Industrial espionage, Fraud detection, Employment discrimination
Dr. Cross has over 20 years of experience as an economist and statistician in academia, government, and consulting. His consulting experience includes testifying as an expert in class-action litigations, antitrust matters, lost profits matters, and employment discrimination matters. Dr. Cross holds a Ph.D. from the University of Wisconsin. He previously taught in the Economics Department at Georgetown University, and has held visiting positions at Johns Hopkins University and the University of Melbourne. Dr. Cross’s experience includes: Being retained as an economic and statistical expert in litigation matters in both U.S. District courts and state courts. He has opined in antitrust, class action, employment discrimination, breach of contract and regulatory matters. Working on litigation matters involving antitrust issues, class certification, statistical sampling, survey design, conjoint analysis, health-care reimbursement, wage and hour cases, product liability, economic dama...

Brian Sowers, MBA

Applied Marketing Science, Inc.

Burlington, Massachusetts
Marketing, Advertising - Survey research, Lanham Act, trademark infringement, trade dress infringement, likelihood of confusion, dilution, secondary meaning, genericness, false/deceptive advertising, class action, Intellectual property
Federal and state level qualified consumer survey expert with 30 years market research experience. Principal at Applied Marketing Science, Inc., a full-service market research and consulting firm. Mr. Sowers has served as a testifying expert and submitted reports to Federal and State Courts, as well the Trademark Trial and Appeal Board, in a variety of litigation matters on behalf of plaintiffs and defendants. He has personally designed and conducted thousands of market research surveys across a broad range of modalities and a broad range of populations. Mr. Sowers hosts an annual CLE accredited webinar on survey evidence in Intellectual Property and serves as an editor for The Trademark Reporter. His expert services include survey design, implementation and analysis, expert report preparation, critique of opposing expert reports, expert testimony, guidance on the deposition and trial questioning of opposing expert witnesses.

Patricia Yanes

Applied Marketing Science, Inc.

Burlington, Massachusetts
Marketing, Advertising - Conjoint Analysis, Class Action, Class Action Lawsuits, Class Action Damage Models, Class Action Litigation, Class Certification, Economic Damages, Market Research, Marketing, Survey Design, Survey Research, Damage Calculations, Damages
Patricia Yanes serves as an expert witness for civil litigation, with a specialty in on conjoint analysis and discrete-choice methodologies for class actions. She has led domestic and international market research engagements for over a decade as a Principal at Applied Marketing Science, Inc. (AMS). Her litigation research experience includes supporting affiliated academic experts in the design and execution of high-stakes consumer litigation, and in preparing rebuttals. She has managed projects with testifying experts on cases related to deceptive advertising, class actions, patent infringement and more. Patty is a master of conjoint analysis, maximum-difference scaling (MaxDiff), total unduplicated reach and frequency (TURF), and choice-modeling techniques. Patty is a member of the American Association for Public Opinion Research (AAPOR), the Institute for Operations Research and Management Science (INFORMS), the Insights Association (IA), and Women in Research (WIRe). She has gu...

Joe Sremack, CISA, CFE

Data and Technology Expert

Marcum LLP

New York, New York
Technology, Software Engineering - data analysis, intellectual property, trade secrets, software failure, wage and hour analysis, class action , GIS and geospatial data, forensic acquisition, misappropriation, biometric data, systems analysis, accounting systems, compliance, data identification, enterprise applications, testimony
Joe Sremack is an advisory partner and leader for the Forensic Data Analytics team. He has over 20 years of experience providing technology, forensics, and data analytics services to address large-scale data, software, and enterprise systems issues. Joe’s practice focuses on delivering advisory services relating to complex data analysis, system and business process analysis, complex data identification and management, data-intensive business process failure and underperformance issues, internal and government investigations, litigation, and regulatory compliance implementation and response. Joe develops software and assesses source code in numerous programming languages and performs data extraction and analysis involving virtually every major enterprise data system, including various ERPs and cloud-based data services. Joe also routinely serves as a litigation expert witness and a regulatory fact witness on behalf of clients. He has experience working across jurisdictions and befor...

Gary S. Barach, CPA, CFE, CFF, CVA

BCG Forensics, LLC

West Chester, Pennsylvania
Business Damages, Economics - fraud, business valuation, business interruption, lost profits, product recall, personal injury, employment cases, discrimination, contract disputes, dispute resolution, economic damages, construction defects, insurance claims, class action, shareholder disputes, bankruptcy, commercial litigation.
Gary S. Barach, CPA, CFE, CFF, CVA, is the founder of Barach Consulting Group, LLC (f/k/a Barach & Company). The firm was established in 1976. He has been retained as a financial forensic and economic expert in over 3,800 cases. His experience in litigation includes business valuation; fraud investigation; bankruptcy; and determining economic damages arising from contract and shareholder disputes, recalled product, and construction defects. Mr. Barach is also a well established expert in economic damages arising from personal injury and discrimination litigation. Mr. Barach’s professional credentials include Certified Public Accountant (CPA), Certified Fraud Examiner (CFE), Certified Valuation Analyst (CVA), and Certified in Financial Forensics (CFF). He has been qualified as an expert in federal, state, and local courts throughout the United States and has never been precluded from offering testimony as the result of a Daubert motion. Mr. Barach’s 40 years of experience include...

Mark A Anderson, SCLA, AIC, AIM, AIS, CCI

Anderson Claim Consulting, LLC

Ninety Six, South Carolina
Insurance - Bad Faith, Coverage, P&C Claims, Commercial Property Claims, Personal Property Claims, Best Practices, Exclusions, Denials, E&O Claims, Class Action, Extracontractual, Catastrophes, Hurricanes, Fraud, SIU, Subrogation, Commercial Auto Claims, P&C Operations
I began my career as an adjuster trainee and worked through every operating level within Claims. As VP of Property, Auto and Liability claims at Liberty Mutual for 36 years and AVP of Commercial Property, Auto and Agribusiness claims with Nationwide for 8 years, I was responsible for Claims operations nationwide. I partnered with defense, coverage and bad faith counsel in the review and oversight of coverage disputes and bad faith litigation. Throughout my career, I have been responsible for the handling, management and leadership of PL and CL Property and Auto claims, field operations along with technical oversight, including the development and implementation of Claim Handling Guidelines "Best Practices". I am extremely familiar with coverage interpretation, best claim practices, bad faith situations, limits, exclusions, claim procedures and building construction issues. As a P&C Insurance claim consultant, I work for both plaintiffs and defendants. I am currently available as...

Rhonda Harper, MBA

Harper Litigation Consulting and Research

Dallas, Texas
Marketing, Advertising - Trademark Survey, Advertising Survey, Consumer Survey (Lanham Act - Likelihood of Confusion, Secondary Meaning, Genericness, Fame, Dilution, Advertising), Class Action, Intellectual Property, Consumer Behavior, Licensing, Deceptive Trade Practices, Fraudulent Business Practices, Rebuttal
RETAINED BY 200+ LAW FIRMS. COURT PROVEN. Ms. Harper has over 30 years’ experience and is one of the few experts who is court qualified across many matters. As a former chief marketing officer for Fortune 500 companies, general manager for a leading global communications agency, serial entrepreneur, and an adjunct marketing professor, she has been engaged by hundreds of law firms in cases regarding intellectual property infringement, misleading advertising, licensing, breach of contract and performance, unfair competition, trade practices, consumer privacy, and standard practices. She has also been a designated expert in more than ten class action lawsuits. As a leading survey expert, Ms. Harper has conducted or rebutted more than 200 Lanham Act trademark, trade dress, and advertising surveys. Since 2005, Ms. Harper has testified more than 100 times in virtually every Federal Circuit Court, along with State Courts, USPTO, TTAB, and in arbitrations through both AAA and JAMS. 2023 C...

Gila Bronshtein, PhD


Vancouver, Washington
Economics, Business Damages - Antitrust, Class action, Trademark Infringement, Intellectual Property, Consumer Fraud, Lost profits, Damages, Discrimination, Statistical Sampling, Class Certification, Contract Dispute, Liability, Wrongful Termination, Personal Injury, Data Security, Data Breach, Wrongful Death, Forensic Economics
Dr. Bronshtein earned her PhD in Economics from Stanford University, paving the way for her notable career in economic litigation. At Cornerstone Research, Dr. Bronshtein has honed her skills in litigation support and expert witness services. Over her career, Dr. Bronshtein managed over 25 expert witness projects in a variety of industries, including tech, automotive, consumer products, and pharmaceuticals. Her profound insights and strategic approach have been pivotal in numerous legal disputes related to product liability, false advertising, data privacy, competition, antitrust, contract disputes, patent or trademark infringement, and discrimination lawsuits. Learn more at