New York Codes, Rules and Regulations
Title 22 - JUDICIARY
Subtitle A - JUDICIAL ADMINISTRATION
Chapter II - UNIFORM RULES FOR THE NEW YORK STATE TRIAL COURTS
Part 202 - Uniform Civil Rules for the Supreme Court and the County Court
Section 202.70 - Rules of the Commercial Division of the Supreme Court
Rule 202.70.13 - Adherence to Discovery Schedule, Expert Disclosure

(a) Parties shall strictly comply with discovery obligations by the dates set forth in all case scheduling orders. Such deadlines, however, may be modified upon the consent of all parties, provided that all discovery shall be completed by the discovery cutoff date set forth in the preliminary conference order. Applications for extension of a discovery deadline shall be made as soon as practicable and prior to the expiration of such deadline. Non-compliance with such an order may result in the imposition of an appropriate sanction against that party pursuant to CPLR 3126.

(b) If a party seeks documents as a condition precedent to a deposition and the documents are not produced by the date fixed, the party seeking disclosure may ask the court to preclude the non-producing party from introducing such demanded documents at trial.

(c) If any party intends to introduce expert testimony at trial, no later than thirty days prior to the completion of fact discovery, the parties shall confer on a schedule for expert disclosure--including the identification of experts, exchange of reports, and depositions of testifying experts--all of which shall be completed no later than four months after the completion of fact discovery. In the event that a party objects to this procedure or timetable, the parties shall request a conference to discuss the objection with the court.

Unless otherwise stipulated or ordered by the court, expert disclosure must be accompanied by a written report, prepared and signed by the witness, if either