Expert witnesses who testify in litigation can express opinions about matters within the scope of their expertise. A highly qualified and credible expert witness can help a party present a persuasive case. Factors to consider in hiring an expert witness are discussed in my blog post, "Hiring Expert Witnesses," which can be found on the website of The Bar Association of San Francisco by clicking on this link.
When cross-examining an adverse party's expert witness, the goals are to minimize the adverse impact of the expert's testimony and, if possible, to obtain concessions from the expert that support your case. A pretrial deposition of the expert can provide a foundation for an effective cross-examination at trial. Specific tips for taking the deposition of an adverse expert are presented in my blog post on NWSidebar, an online publication of the Washington State Bar Association, which can be accessed by clicking on this link.