Rebuttal Expert Witnesses

Walnut Creek, California

Psychology, Forensic Psychology - forensic psychologist, psychological injury, PTSD evaluation, trauma assessment, interpersonal violence, IME, personal injury, sexual harassment, expert witness, record review, rebuttal expert, causation, impairment, malingering, symptom validity, workplace trauma, disability evaluation, trauma expert, VA disability, trauma disorder

Christine E. Valdez, Ph.D., ABPP is a California licensed clinical psychologist and board-certified in clinical psychology. She specializes in forensic psychology and is retained in civil litigation to provide forensic psychological evaluation and consultation in cases involving trauma, PTSD, interpersonal violence, and psychological injury. Dr. Valdez has conducted over 1,000 forensic evaluations through her work with the U.S. Department of Veterans Affairs, including disability and compensation-related assessments. Her evaluations address diagnosis, causation, and functional impairment and are grounded in both clinical expertise and research in traumatic stress. Dr. Valdez is a Professor of Clinical Psychology at California State University, Monterey Bay, where she teaches psychopathology and advanced research methods and trains clinicians in assessment and diagnosis. She has authored over 25 peer-reviewed publications and delivered more than 50 professional presentations on tra...

San Francisco, California

Acoustics, Video - Audibility, Audio Technology, Patent & copyright (audio), Musicology, Acoustic measurement, Digital Authentication, Video enhancement, Forensic Musicology, Warning Signals, Audio enhancement, Rebuttal, Accident analysis: audibility, Speech Intelligibility, body worn camera videos, Audio Forensics

Expert consultant in the areas of acoustics; video and audio evidence recordings; audio patent infringement analysis; acoustic measurement; speech intelligibility and warning signal audibility; human factors and psychoacoustics; musicology and copyright infringement; voice comparison; and recorded gunshot analysis. Authentication, speech enhancement, signal identification and analysis of audio-video recordings in legal cases. Body worn camera, dash cam, security camera, cell phone analysis. Research scientist, psychoacoustics, NASA 1988-2025; Consultant; Salter Associates, 1996-current. Consultation in over 1000 audio-video and acoustic forensic cases since 1987. Expert testimony in over 100 cases in court or depositions, in U.S. Federal and State courts including the United States International Trade Commission (USITC), and courts in Canada and International arbitration panels (World Bank-ICSID).

Dallas, Texas

Intellectual Property, Marketing - Trademark Survey, Advertising Survey, Consumer Survey, Secondary Meaning, Genericness, Fame, Dilution, Advertising, Class Action, Intellectual Property, Consumer Behavior, Licensing, Deceptive Trade Practices, Fraudulent Business Practices, Rebuttal, Likelihood of Confusion, Trademark Infringment, Standards and Practices, Marketing

Ms. Harper is a nationally recognized marketing and consumer perception expert retained by hundreds of law firms in high-stakes matters involving trademark infringement, false and misleading advertising, licensing disputes, branding conflicts, and complex marketing issues. Since 2005, she has been retained by more than 300 law firms to conduct or rebut nearly 300 litigation-focused consumer surveys and reports, author over 100 expert marketing reports, and testify more than 150 times. Her work is grounded in rigorous methodology, real-world marketplace experience, and a deep understanding of how consumers perceive brands, messaging, and competitive claims. With over 35 years of senior executive corporate leadership, Ms. Harper previously served as a Fortune 500 Chief Marketing Officer for two companies and as Senior Vice President and General Manager at a global communications agency. She has also served as an adjunct professor of marketing and is a successful serial entrepreneur....