Jonathan L. Mate

Jonathan L. Mate: Attorney with Newman, Simpson & Cohen, LLP AV stamp icon
Attorney Awards


For over forty years Jonathan L. Mate has practiced law with a specialty in trust and estates. He was first admitted to the Bar of the State of New York in 1970, and thereafter he was admitted to the Bars of New Jersey and Florida. He was a partner in the New York law firm of Hesterberg & Keller, LLP, a firm with a reputation for their expertise in all types of estate matters including estate planning, probate, estate administration, estate litigation, succession planning, and general real estate transactions. Mr. Mate graduated from Boston University with a Bachelor of Arts Degree in 1967. He attended Brooklyn Law School and received his Juris Doctor degree in 1970 and a Master of Laws degree (LL.M) in Taxation from New York University in 1980.

Jon is a member of the Real Property, Trust & Estate Law Section of the American Bar Association, the Real Property and Probate Trust Law Section of the Florida Bar and the Bergen County Bar Association (New Jersey). He is also a member of the Greater New Jersey Estate Planning Council. Jon has earned an AV® Preeminent™ Peer Review rating from Martindale-Hubbell®.

Jon’s clients include high net worth individuals for whom he has provided legal services in connection with estate planning, succession planning, probate administration and various estate tax issues in New York, New Jersey, and Florida. John regularly consults with the firm’s business clients to assist them with their business succession and estate planning needs.

Jon has served on the Board of Trustees of the YJCC of Bergen County and has acted as counsel to that organization and is a former member of the Endowment Committee. He has also been appointed as a Guardian ad Litem by the Surrogate of New York County in several matters and has served as an Executor and Trustee in various estates.

Jonathan has earned an AV® Peer Review Rating from Martindale-Hubbell®, the highest rating for legal ability and general ethical standards.

Areas of Practice (3)

  • Trusts and Estates
  • Estate Planning
  • Estate and Gift Taxation

Education & Credentials

Contact Information:
201.487.0200 Ext. 26  Phone
201.487.8570  Fax
University Attended:
Boston University, A.B., 1967
Law School Attended:
Brooklyn Law School, J.D., 1970; New York University, LL.M., 1980
Year of First Admission:
1975, U.S. District Court, Southern District of New York and U.S. District Court, District of New Jersey; 1975, U.S. District Court, Eastern District of New York; 1970, New York; 1972, New Jersey; 1979, Florida; 1991, U.S. Supreme Court

Member, Bergen County Bar Association; Member, Greater New Jersey Estate Planning Counsel; Member, Board of Trustees, YJCC Bergen County, Endowment Foundation; Member, American Bar Association, Real Property, Trust and Estate Law section; Member, Florida Bar Association

Birth Information:
Bronx, New York, April 27, 1945

Peer Reviews

A Martindale-Hubbell Peer Rating reflects a combination of achieving a Very High General Ethical Standards rating and a Legal Ability numerical rating.

*Peer Reviews provided before April 15, 2008 are not displayed.

Hackensack, New Jersey