Henry Christensen III is a member of the international law firm of McDermott Will & Emery LLP, where he is the co-managing partner of its private clients practice group in New York, and managing partner of its international private clients practice. He conducts an active practice advising clients in connection with their tax and estate planning and in tax and probate dispute work, and has an extensive international practice advising multinational families, family offices and trustees. He is the former chair of the International Committee of the American College of Trust and Estate Counsel (ACTEC) and is the Chancellor and a past President of the International Academy of Estate and Trust Law (IAETL). He often meets with the US Treasury on behalf of ACTEC and other professional organisations regarding tax policy. He is an honours graduate of Yale College and Harvard Law School.

Mr Christensen teaches courses in international estate planning in the graduate estate planning programme at the University of Miami Law School and in the graduate tax programme at New York University Law School. He has written and lectured widely on various tax and estate planning subjects, including at the Heckerling Institute, ALI-ABA, ACTEC, the IAETL and PLI. He is the author of the treatise, International Estate Planning (Matthew Bender & Co, 2nd edition, September 1999), updated annually. He is a member of the board of editors of Trusts and Trustees, published by Oxford University Press.