An expert witness is a witness who has specific knowledge of a particular field that is generally greater than what is known by an average layperson. An expert is usually permitted to testify to his/her opinion. A layperson can testify only as to the facts in question. In a construction accident case, your doctor (or one picked by our law firm) may testify as to the extent of your permanent injuries. An "accident reconstruction" expert may be called to testify as to what and how the accident occurred. An economist may testify as to your economic damages caused by the injury. Turley, Redmond, Rosasco & Rosasco, LLP will "advance" for our clients the substantial costs necessary to secure this expert testimony when needed.