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Litigation. Collaborative Law. Mediation.

Kieth Rieger

Kieth  Rieger Photo
Kieth Rieger Partner


Mr. Rieger has focused in the area of matrimonial law for more than four decades.  His practice includes the negotiation and litigation of complex matrimonial and family law matters. Throughout his career, Mr. Rieger has handled a number of challenging and complex matters, including significant equitable distribution and interstate custody trials. Mr. Rieger even set legal precedent in a landmark custody case involving the rights of a non-biological father.

As an authority in his field, Mr. Rieger regularly speaks to attorneys in continuing legal education programs. He is a past Dean of the Nassau Academy of Law and served on the New York State Continuing Legal Education Board. He has also held leadership positions in the New York State Bar Association’s Family Law Section, New York Family Law American Inn of Court, and the Nassau County Bar Association, and he is a longtime member of the American Academy of Matrimonial Lawyers.

Mr. Rieger’s writing on family law topics has been published in the Family Law Review, Strategies for Family Law in New York, and The Nassau Lawyer. He has lectured on family law issues at the New York State Bar Association, the Nassau and Suffolk County Bar Associations, and the New York State Judicial Institute Seminars for Supreme Court Justices, Family Court Judges and Court Attorneys; and has taught at Hofstra University School of Law. He has been named to Super Lawyers, and was named the Family Law Long Island Lawyer of the Year by Best Lawyers in 2020.

Areas of practice

  • Divorce Litigation
  • Divorce Negotiation
  • Postnuptial Agreements
  • Prenuptial Agreements
  • Equitable Distribution
  • Marital Agreements
  • Spousal Support
  • Child Custody
  • Child Support
  • Paternity
  • Post-divorce Actions
  • Appeals
  • Domestic Violence


  • Hofstra University School of Law 
  • State University of New York at Stony Brook 

Admitted to Practice Law

  • New York State, 1980
  • Federal courts, 1980
  • U.S. Supreme Court, 1991

Professional Memberships

  • Fellow, American Academy of Matrimonial Lawyers, New York Chapter (1991-2021)
  • New York State Continuing Legal Education Board: 2010-2013
  • New York State Bar Association Family Law Section, Executive Committee 1994-present
  • Nassau County Bar Association, Chair Matrimonial Committee 1992-1994, Board of Directors 1994-1997, 1998- 2001, 2010-2013, Judiciary Committee 1991-1995, 2001-2006
  • Nassau Academy of Law, Secretary 2003-2005, Treasurer 2005-2006, Assistant Dean 2006-2007; Associate Dean, 2008-2009, Dean 2009-2010
  • New York Family Law American Inn of Court, Barrister, 1995-2012; Master 2012 to present; Counsel, 2017-2019; President, 2019 to 2021
  • Nassau Lawyers Association of Long Island (Board of Directors, 1988-1993)
  • Board of Directors of FOCUS (For our Children and Us) (1995-2010)
  • Hofstra University School of Law, Board of Advisors - Center for Children, Families and the Law

Honors and Recognitions

  • AV Preeminent, Martindale Hubbell
  • Super Lawyers, 2008-2022
  • Ten Leaders, Divorce Law
  • Best Lawyers in America, Family Law Long Island Lawyer of the Year, 2020


  • “The Need for Mental Health Professionals in Custody/Access Litigation,” Family Law Review, Summer 2020
  • “Shaping a Strategy for Divorce Cases.” Aspatore; Strategies for Family Law in New York (WestPublishing), 2012 Edition
  • Associate Editor, Publications Committee for The Nassau Lawyer, 1991-1995
  • Custody Relocation, May 1993; “Non-Durational or Permanent Maintenance”, New York Family Law American Inns of Court Annual Survey
  • “Setting Aside Fraudulent Transfers to Enforce Support Arrears”, Family Law Review, 1992
  • “Enhanced Earning Capacity - Where Has O’Brien Gone?” The Nassau Lawyer, October, 1991
  • “Reimbursement Maintenance - A Call for Fairness”, Family Law Review, 1985
  • “UCCJA: Panacea or New Dilemmas for Interstate Custody Litigation”, Family Law Review, 1984
  • Preparation of numerous written materials for New York State Bar Association, Nassau and Suffolk Academy of Law CLE programs
  • Editor, “Recent Decisions in Matrimonial Law”, distributed by the Nassau County Bar Association to the members of the bench and the Matrimonial Law Committee, 1990-1992



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