In the winter 2019 issue of the ABA's Journal of the Section of Litigation, Maria Rodriguez published "The Dangers of Overzealous Experts." The following is an excerpt:
For attorneys, zealous representation of a client is required. For experts, "zealous representation" is flatly inconsistent with what they purportedly bring to the process. An overzealous expert can tank your case and is much more dangerous than the opposite—the expert who is meek or not zealous enough.
The expert who is too gung-ho, too invested in helping your client or too eager to see a certain outcome is bad news. Savvy lawyers love facing off against overzealous experts; they are easy witnesses to pick off and jurors distrust them.