What is an Expert Witness?

Understanding the role, and limitations, governing expert witnesses in licencing matters » Jillian M. Siskind & Associates

An expert witness is an individual with specialized knowledge, skills, or experience in a particular field who is called upon to provide their professional opinion and expertise in legal proceedings. These professionals play a crucial role in assisting courts and juries in understanding complex technical or scientific matters that are beyond the scope of an average person’s understanding.

Expert witnesses are typically hired by one of the parties involved in a legal case to provide objective analysis, interpretation, and opinions based on their extensive knowledge and expertise.

Fields of Expert Witness


An example of an expert witness firm in the engineering space is Alpine Engineering, with expertise in a range of services:

Accident Reconstruction: Alpine Engineering provides analysis and reconstruction of accidents to determine causation, contributing factors, and potential liability.

Product Liability Analysis: Their experts evaluate products to assess design defects, manufacturing defects, and failure to warn, among other factors.

Mechanical Design Analysis: Alpine Engineering offers analysis and evaluation of mechanical designs to ensure compliance with industry standards and safety regulations.

Failure Analysis: They investigate failures in materials, components, and systems to determine the root cause and potential liability.

3D Scanning Services: Alpine Engineering utilizes advanced 3D scanning technology for accurate data capture, visualization, and analysis in legal cases.


An example of an expert witness firm in the biomedical space is American Medical Forensic Specialists (AMFS), with expertise in several areas:

Medical Expert Witness Services: AMFS provides medical experts who offer opinions and testimonies in medical malpractice, personal injury, and wrongful death cases.

Medical Records Review: Their experts review and analyze medical records to identify potential negligence, errors, or deviations from standard practices.

Life Care Planning: AMFS offers comprehensive life care plans that estimate the cost of medical care, rehabilitation, and support for individuals with long-term injuries or disabilities.

Other Fields with Expert Witnesses

In addition to engineering and biomedical, there are several other fields that frequently utilize expert witnesses:

Forensic Experts: Forensic experts provide specialized knowledge in areas such as digital forensics, forensic accounting, and forensic psychology.

Financial Experts: Financial experts offer expertise in areas like business valuation, economic damages, and financial fraud investigations.

Securities Experts: Securities experts provide insights into complex financial securities, trading practices, and regulatory compliance.

Parenting Experts: Parenting experts offer professional opinions and evaluations related to child custody, visitation rights, and parental fitness.


Expert witnesses play a vital role in legal proceedings by offering their specialized knowledge, skills, and experience. They assist courts and juries in understanding complex matters and provide objective analysis and opinions. Whether in engineering, biomedical, or various other fields, expert witnesses contribute to the pursuit of justice and facilitate a better understanding of intricate subjects within the legal system.