David G. Mandelbaum is Co-Chair of the firm's Environmental Practice. He represents clients faced with problems under the environmental laws that have no conventional solution, or for which the conventional solution would yield an unacceptable result. While he regularly represents clients in lawsuits, he does not restrict his practice to litigation and has helped clients achieve satisfactory outcomes through regulatory negotiation or private transactions.

David has represented clients in Superfund matters – particularly contaminated sediment and natural resource damage issues – that the government considers its most significant. In 2012, he acted as lead counsel for our client in two trials arising from the Lower Fox River and Green Bay Site, one on a Superfund contribution claim and one on the United States’ claim for a mandatory injunction.

David represents natural gas exploration and production companies, midstream providers, and landowner coalitions in connection with development of the Marcellus Shale and other natural gas resources. He regularly handles permit appeals and citizen suits under the water pollution, air pollution and solid waste laws. He has represented clients in litigation under the National Environmental Policy Act (NEPA) and several disputes among private parties following failed or unsatisfactory transactions.

David was one of the original appointments to the Pennsylvania Statewide Water Resources Committee, which is responsible for the State Water Plan. He has advised clients in water supply matters, and has appeared before water supply agencies such as the Delaware River Basin Commission.

David teaches Superfund, and Oil and Gas Law in rotation at the Temple Law School. He has taught Environmental Law, Climate Change and Land Use Law and Administration in the past, and he is a regular writer and speaker on the subjects.