Whether you need an expert witness depends on the type of case you have.  An expert witness may be necessary to prove the fault of the person or company that injured you.  Or an expert witness may be needed to prove the full scope of the damages you have sustained.  For instance, an expert witness might be necessary to present proof of future medical bills or of future lost wages. These are just two types of examples, although they are the most common.  Part of our job is to find a well-qualified expert if your case needs one.