A Western Pennsylvania Firm You Can Trust. Tershel & Associates’ main offices are in Washington, Pennsylvania. For more than 30 years, Tershel & Associates has proven that effective legal representation is close to home. Our firm has an established record of success, both at trial and the negotiating table. We devote our full energy and skill to obtaining judgments and settlements for catastrophically injured people. Because we focus strictly on medical malpractice and other personal injury cases, we have the ability to take on the largest companies. We have successfully resolved and won cases against such defendants as Chrysler, Ford, Emerson Electric, West Penn Power and others.*