An Expert Witness is a professional and an expert in a field with the capacity to provide a professional opinion on a subject matter for a case during legal proceedings. In business valuation analysis, the main role of an Expert Witness is to express a professional opinion on the value of a business entity or part ownership which is the subject of a legal proceeding. Business valuation professionals typically provide expert witness testimony concerning fair market value, intrinsic value, invested capital, liquidation value, as well as related valuation issues at the centre of the legal proceedings.