Expert

Professional who is designated by a court, on account on his/her expertise in a particular field, to give an opinion on matters of fact relevant to the resolution of a case (e.g., to quantify damages in a complex economic case or to assess causality in a medical case). Experts may also deliver "expert evidence" within the area of their expertise. Their opinion may be rebutted by testimony from other experts or by other evidence or facts. Parties may choose their own experts (referred to as “counsel experts”) in order to verify, contradict or confirm the court expert’s findings.