Ivan A. Sacks

Partner | New York

Ivan is a partner in the private client and tax team.

He is a private client lawyer and trusted advisor to international and domestic families of significant wealth. Ivan is a member of the firm’s Latin American and Asia-Pacific groups and was also global chairperson of Withersworldwide from July 2013 to July 2019.

Both in the US and in an international context, he counsels families and entrepreneurs on the structuring of their closely held business interests, family offices, and charitable foundations, the design and administration of trusts and estates, and comprehensive risk management, governance and succession planning. He also frequently advises banks and trust companies on fiduciary matters.

Ivan is admitted to the bar of the State of New York and the Federal District Court for the Southern District of New York. He graduated from Columbia Law School, where he was a Harlan Fiske Stone Scholar, a Charles Evans Hughes Fellow and Editor-in-Chief of the Columbia Human Rights Law Review. He is an active member of several bar and professional bar associations and speaks frequently on topics related to wealth planning.

He also serves as a director or other fiduciary for a number of private and non-profit organizations.

Ivan is ranked among Legal Week’s Private Client Global Elite, and is also listed as a New York Super Lawyer, by Chambers & Partners and on Citywealth Leaders List.

Secretary Rosa Marrero


I trust him impeccably, and that is why he handles my affairs.

Chambers HNW 2018, USA

Ivan is a person who I have the utmost confidence in and is one of the first people I turn to in order to assure my clients are given the best legal services available.

Citywealth Leaders List, 2016

He is an extremely able lawyer with a big clientele.

Chambers HNW 2016, New York

He has had a lot of exposure to international estate planning,” one source comments, adding: “He represents a number of clients in Latin America, and is a good and solid guy with good judgement. I trust him impeccably, and that is why he handles my affairs.


He’s someone you want to place your trust in, he manages clients’ expectations very well and is very responsive.

Chambers HNW 2019, New York





State of New York, 1993

Registered Foreign Lawyer in the UK, 2003

Association of the Bar of the City of New York

Society of Trust and Estate Practitioners

Chambers USA American Leading Lawyer

New York State Bar Association

Moderator, ‘COVID-19 Update: Economic outlook and the impact of changing travel restrictions and immigration policies,’ Webinar with Goldman Sachs and Withersworldwide - May 21, 2020

Moderator, ‘Tax reform and the family office’, Withers New York event - June 2018

Speaker, ‘Going for the gold? Adding gold to your asset allocation,’ Withers New York event - February 5, 2018



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New York

430 Park Avenue,

10th Floor,

NY 10022-3505

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