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Jonathan A. Galler concentrates his practice in the areas of probate and trust litigation, as well as commercial litigation, representing fiduciaries and beneficiaries in high stakes trust and estate disputes. Working closely with Proskauer's team of estate planning and administration lawyers, Jonathan litigates undue influence claims, will and trust contests, inheritance disputes, breach of fiduciary duty claims, trust construction and modification actions, and similar probate and trust matters through all phases of dispute resolution.

In the area of commercial litigation, Jonathan has represented some of the world's largest financial, pharmaceutical and telecommunications companies. His matters include contract disputes, securities claims, antitrust law and white collar criminal investigations.

Jonathan currently chairs the Florida Probate Rules Committee for the 2017-2018 year, a standing committee of the Florida Bar that writes and revises the statewide rules governing probate and guardianship. He is also a member of the Executive Council of the Real Property, Probate and Trust Litigation Section of the Florida Bar.

Jonathan writes and speaks frequently on probate and trust litigation topics. He formerly co-authored a monthly column on the rules of civil procedure for the Palm Beach County Bar Bulletin. He currently co-authors a quarterly column on Florida probate law for the New York State Bar Association Trusts and Estates Law Section Newsletter.

Jonathan is also one of the lead editors for Proskauer’s blog on business litigation, Minding Your Business.