William J. Kambas

Partner at Withers

Speaker

Bill is a US tax lawyer and partner at Withers. He has extensive experience with US federal, state, and international income, estate, and trust taxation and has represented a wide variety of private and public clients, including family-owned, start-up, and multi-million dollar enterprises on purely domestic as well as inbound and outbound business and investment transactions, focusing not only on the transaction itself, but also on post-closing matters, smooth operations, and ongoing compliance. Key aspects of his practice include establishing and working with family offices, private trust companies, and family investment partnerships. In recognition of his family offices work, contributors to Family Capital magazine observed that, "[Bill runs the gamut] of family enterprise matters, particularly tax planning and cross-border investments," and, "[he] is a true professional, working diligently to solve challenging legal and regulatory issues family enterprises often face." Bill has participated in numerous speaking engagements, industry memberships, and publications. For example, Bill has been a guest lecturer at the USC Tax Institute, the Heckerling Institute, the Hellenic Studies Program at Yale University, the Columbia Business School's Family Business Program at Columbia University, the University of Connecticut School of Law, and the Charles F. Dolan School of Business at Fairfield University, as well as with the International Fiscal Association, American Bar Association, and the Society of Trusts and Estates Practitioners. Bill has been recognized by a number of industry groups, including repeatedly by Chambers, Legal 500, and Best Lawyers, and as one of the top ten advisors on the 2024 The FamCap 50 Advisors list in Family Capital magazine, as one of the 21 People to Know When Starting a Family Office by Business Insider in 2022; one of the Top 100 Family Influencers by Family Capital Media in 2020; as a “key lawyer” by The Legal 500 US in the area of international tax and not-for-profit in 2021 and 2020; and as one of the Connecticut Law Tribune's New England Trailblazers for 2019. Bill is a member of the Advisory Board of The UHNW Institute, as a Fellow of the American Bar Foundation, and a Fellow of the American College of Tax Counsel ("ACTC").