The Appellate Division, in Kleinman v Weisman Law Group, P.C., 176 AD3d 1046 [2d Dept 2019], dismissed a former client’s legal malpractice action based upon the doctrines of res judicata and collateral estoppel. The court stated as follows:
In 2013, the defendant Weisman Law Group, P.C. (hereinafter the defendant firm), commenced an action against the plaintiff to recover unpaid legal fees in the Nassau County District Court. The plaintiff asserted a counterclaim, alleging that he was overbilled by the defendant firm. A judgment was entered in favor of the defendant firm and against the plaintiff. The plaintiff appealed the judgment of the Nassau County District Court to the Appellate Term of the Supreme Court for the Ninth and Tenth Judicial Districts, which affirmed the judgment (see Weisman Law Group, P.C. v. Kleinman, 60 Misc.3d 133[A], 2018 N.Y. Slip Op. 51042[U], 2018 WL 3309514 [App Term, 2d Dept, 9th & 10th Jud Dists 2018] ). In 2016, the plaintiff commenced the instant action against the defendants asserting causes of action alleging, inter alia, breach of contract and legal malpractice.
The plaintiff contends that the doctrines of res judicata and collateral estoppel do not apply in the instant case, as the Nassau County District Court lacked subject matter jurisdiction over his counterclaim in the prior action. Contrary to the plaintiff’s contention, the Nassau County District Court did have jurisdiction over his counterclaim pursuant to Uniform District Court Act Section 208(b), as the counterclaim was for money only. The doctrine of res judicata precludes the plaintiff from litigating the claims set forth in his complaint, as a judgment on the merits exists in the prior action between the same parties involving the same subject matter (see Matter of Josey v. Goord, 9 N.Y.3d 386, 389, 849 N.Y.S.2d 497, 880 N.E.2d 18; Matter of Hunter, 4 N.Y.3d 260, 269, 794 N.Y.S.2d 286, 827 N.E.2d 269). New York has adopted the transactional analysis approach to res judicata, so that once a claim is brought to a final conclusion, all other claims between the same parties or those in privity with them arising out of the same transaction or series of transactions are barred, even if based upon different theories or if seeking a different remedy (see Matter of Josey v. Goord, 9 N.Y.3d at 389–390, 849 N.Y.S.2d 497, 880 N.E.2d 18; Matter of Hunter, 4 N.Y.3d at 269, 794 N.Y.S.2d 286, 827 N.E.2d 269; *124 O’Brien v. City of Syracuse, 54 N.Y.2d 353, 357, 445 N.Y.S.2d 687, 429 N.E.2d 1158; Greenstone/Fontana Corp. v. Feldstein, 72 A.D.3d 890, 893, 901 N.Y.S.2d 643).
Furthermore, the plaintiff’s causes of action are barred by the doctrine of collateral estoppel, which precludes a party from relitigating in a subsequent action or proceeding an issue clearly raised in a prior action or proceeding and decided against that party or those in privity, whether or not the tribunals or causes of action are the same (see Ryan v. New York Tel. Co., 62 N.Y.2d 494, 500, 478 N.Y.S.2d 823, 467 N.E.2d 487; Williams v. New York City Tr. Auth., 171 A.D.3d 990, 97 N.Y.S.3d 692). The doctrine of collateral estoppel applies here, as the issues in both actions are identical, the issue in the prior action was actually litigated and decided, there was a full and fair opportunity to litigate the action, the issue previously litigated was necessary to support a valid and final judgment on the merits, and the defendant Rachel J. Weisman was in privity with the defendant firm (see Conason v. Megan Holding, LLC, 25 N.Y.3d 1, 17, 6 N.Y.S.3d 206, 29 N.E.3d 215; Williams v. New York City Tr. Auth., 171 A.D.3d at 991–992, 97 N.Y.S.3d 692; Karimian v. Time Equities, Inc., 164 A.D.3d 486, 83 N.Y.S.3d 227).