• Advising Hudson’s Bay Company on environmental, health and safety aspects of its $2.9 billion acquisition of Saks Incorporated
• Representing a hedge fund on environmental and endangered species aspects in connection with a series of complex, multi-party transactions resulting in its acquisition of a portfolio of properties including much of Kiawah Island, South Carolina
• Advising Warburg Pincus on environmental, health and safety aspects of numerous transactions, including its $195 million acquisition of JHP Pharmaceuticals, LLC.
• Advising Seven Mile Capital Partners II LP on environmental, health and safety aspects of its $120 million acquisition of Microporous Products from Polypore International Inc.
• Advising Auxilium Pharmaceuticals, on environmental, health and safety aspects of its $657 million acquisition of Actient Holdings LLC

Prior to joining Willkie, Bill was with Skadden, Arps, Slate, Meagher & Flom LLP, and was Americas Environment Head for Clifford Chance LLP.

Bill is a member of the American Bar Association’s Sections on Environment, Energy and Resources (SEER) and International Law (SIL), having previously served on the governing Council for both sections, as well as past Chair of the International Environmental Law committees of both SEER and SIL. He is also a member of the International Bar Association, the American Society of International Law, and the IUCN Commission on Environmental Law.

Bill serves as a member of several other bodies, including the Strategic Advisory Counsel of the Erb Institute for Global Sustainable Enterprise (a partnership between the School of Natural Resources and Environment and the Stephen M. Ross School of Business at the University of Michigan), the External Advisory Board of the Graham Environmental Sustainability Institute at the University of Michigan, the Advisory Committee to the Carbon Disclosure Standards Board, and the U.S. Advisory Council to the Carbon Disclosure Project.

Bill appears frequently at national and international conferences, and is a widely published author on environmental law, policy and related matters of corporate strategy. In 2007, he served as Chair of ABA SEER's annual Conference on Environmental Law in Keystone, Colorado. In 2016, Bill was selected to serve on Law360’s Environmental Editorial Advisory Board.

Bill’s body of published work includes contributions to the Cross-Border Environment Handbook (PLC 2010/11), Stumbling Toward Sustainability (John Dernbach ed., ELI 2002), and Environmental Law and Enforcement in the Asia-Pacific Rim (Terri Mottershead ed., Sweet & Maxwell 2002).

Bill's articles on environmental issues have appeared in The National Law Journal, Natural Resources & Environment, Review of European Community & International Environmental Law, The International Lawyer, International Financial Law Review, Georgetown International Environmental Law Review, BNA's Environmental Law Reporter, European Environmental Law Review, Corporate Environmental Strategy, Project Finance International, Carbon Business and Environmental Finance, among others. He also serves on several editorial advisory boards, including those of BNA's Environmental Due Diligence Guide, Carbon & Climate Law Review, Sustainable Development Law & Policy, and Environmental Liability.