A Précis of the Art and Science of Expert Witness Testimony: a Tribute to the Work and Ideas of Karen Postal.

This article summarizes Dr. Karen Postal’s contributions to effective communication in neuropsychological expert testimony, emphasizing three foundational "disruptive shifts" she identified for forensic neuropsychologists. First, experts must recognize that jurors have the most challenging intellectual role in the courtroom and develop a direct, dynamic relationship with them by speaking in accessible, relatable language. Second, credibility extends beyond sound methodology to include the expert’s personal demeanor, empathy, and respect, which foster juror trust across diverse backgrounds. Third, experts should disrupt traditional academic communication by using plain language, vivid metaphors, storytelling, and visuals to make complex information memorable and understandable. The article also addresses strategies for maintaining composure and credibility during cross examination and highlights the importance of mentorship in forensic neuropsychology.