by Tony Klapper Managing Director, Litigation Consulting A2L Consulting In our last post, we discussed why expert witnesses should rely on visual aids and litigation graphics in preparing their testimony. Another key point for expert witnesses is that no matter how well credentialed a witness is, if the jury thinks he is a jackass or if he acts in a way that is inconsistent with jurors’ perception of how an expert should act, his testimony will be useless. In every trial, the jury and the judge evaluate the credibility of every witness who testifies. If you have done something as a witness to lessen your credibility quotient, what you say will either be filtered through that lens or not even considered. For example, some experts make the mistake of engaging opposing counsel in a pitched battle during cross-examination. While a feisty expert who resists answering “yes” or “no” questions might be seen by her attorney as a hero, the jury more likely sees an expert who is being difficult -- particularly when the “yes” and “no” questions are intuitively answerable. Similarly, an expert who regularly resorts to “I don’t recall” and “I don’t know” responses to questions that objectively seem knowable and recallable also undercuts her credibility. The same is true of an expert who fights over the meaning of words that have common meanings, or starts asking questions of the questioner.