Harnik Law Firm has a national litigation practice before state and federal courts at both the trial and appellate levels. The firm has handled a broad range of commercial and contract disputes. Attorneys in the firm have expertise in litigation of cases arising under trademark and copyright laws, and in cases involving appellate practice, art law, commercial fraud, commercial law, computer technology, debtor and creditor, directors' and officers' liability, distributorship disputes, employment law, internet law, non profit and charitable organizations, offshore voluntary disclosure, and unfair competition.

Harnik Law Firm has had substantial experience in prosecuting and defending claims before arbitration tribunals. The firm has handled numerous matters before the American Arbitration Association and the enforcement of arbitral awards and the conversion of arbitral awards to money judgments.