Robert J. Yarbrough has practiced law for forty years. He is licensed to practice before the United States Patent and Trademark Office and holds a degree in mechanical engineering. He is a partner in Lipton, Weinberger & Husick. Mr. Yarbrough also is an environmental attorney licensed in Pennsylvania and Kentucky. In environmental matters, he is counsel to Drinker, Biddle & Reath LLP, a firm of over six hundred lawyers with offices in Philadelphia, Washington, D.C., Princeton, Los Angeles and San Francisco. Mr. Yarbrough worked in the Environmental Practice Group of Drinker, Biddle & Reath from 1996 until 1998 and in the environmental department of Cohen, Shapiro, Polisher, Shiekman & Cohen, a Philadelphia regional firm, from 1989 through 1995. He enforced environmental laws for the Commonwealth of Kentucky from 1977 through 1988.