Law Offices of Mark S. Helweil

The Helmsley Building, 230 Park Avenue, 18th Floor 10169, United States


Practice Areas: Divorce, Child Custody, Equitable Distribution, Child Support, Maintenance, alimony, Pre-Nuptial Agreements, Post-Nuptial Agreements, Separation Agreements, Paternity.

See Testimonial Section at

A New York native, Mark returned to New York upon his admittance to the state's bar in 1981 after graduating from the University of Florida (B.A., summa cum laude, 1977) and the American University Law School (J.D., 1980). Following law school, Mark served as an Assistant District Attorney in Bronx County (1980-1985), where he was a Senior Trial Attorney in the Sex Crimes Bureau (1984-1985). During his time as an Assistant District Attorney, Mark met his wife Susan who worked as an Attorney with juvenile offenders and in the Domestic Violence Bureau. Together they have raised three boys. In 1986, he opened his own law practice focusing on matrimonial and family law. In addition to his own legal practice, Mark maintains an of-counsel status with Rottenberg Lipman Rich, P.C. Mark was named as a Superlawyer in 2014, 2015, 2016, 2017.

Lisa C./R v. William R.
Mark successfully obtained a protective order on behalf of his client prohibiting his adversary and his client's wife from publicly disseminating court transcripts.

Lammers v. Lammers
The Appellate Division, First Department, affirmed the lower court's award of attorney fees to Mark and imposed stringent restrictions upon Mark's client's wife's ability to file motions due to her prior litigiousness.

Bast v. Rossoff
Court of Appeals landmark case where Mark, on behalf of the wife, successfully argued that the Child Support Standards Act should be implemented in shared custody cases.

Ochs v. Ochs
In a contested custody proceeding, Mark successfully argued that the Court should prohibit the disclosure of the court appointed forensic psychologist's notes prior to the trial. In addition, in 2007, the appellate division reduced the equitable distribution award initially directed by the lower court based upon Mark's appellate brief and oral argument.

Best v. Best
Mark represented the father, who won sole custody of the parties' two year old daughter. The mother than kidnappd the daughter and fled to Israel. Mark coordinated a team of lawyers and private investigators and located the daughter hidden at a school in Israel and orchestrated the return of the daughter to the United States. The mother ultimately served fifteen months in federal prison. Mark was the sole attorney for the father. The Mother was represented by twenty-two attorneys.

The Helmsley Building, 230 Park Avenue, 18th Floor 10169, United States
The Helmsley Building, 230 Park Avenue, 18th Floor 10169, United States
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