N.Y. Jud. Law § 471

§ 471. Attorney who is judge's partner or clerk prohibited from\npracticing before him or in his court. The law partner or clerk of a\njudge shall not practice before him, as attorney or counsellor in any\ncause, or be employed in any cause which originated before him. A law\npartner of, or person connected in law business with a judge, shall not\npractice or act as an attorney or counsellor, in a court, of which the\njudge is, or is entitled to act as a member, or in a cause originating\nin that court; except where the latter is a member of a court, ex\nofficio, and does not officiate or take part, as a member of that court,\nin any of the proceedings therein.\n