An expert witness is a professional with specialized knowledge, skills, or experience in a specific field, making them qualified to provide testimony in legal cases. For a patent expert witness, qualifications typically include advanced degrees, industry experience, and a thorough understanding of patent law. Courts assess an expert’s credentials based on the Federal Rules of Evidence, particularly Rule 702, ensuring that their testimony is relevant and reliable. Reputable expert witness firms carefully vet professionals to ensure they meet these qualifications.