With experience in government contracts (especially those involving national defense issues), antitrust, and patent litigation, Ari Zymelman's practice consists of complex business litigation and counseling, often about technology. 

Mr. Zymelman has experience in a wide-range of government contracting and national defense issues. He has litigated and counseled on bid-protests, termination issues, defective pricing, false claims, and other government contracting issues. Currently Mr. Zymelman represents L-3 Services, Inc. in lawsuits arising out of the Abu Ghraib disclosures. After prevailing on the first wave of cases on motions to dismiss and for summary judgment, he successfully defended the judgments before the U.S. Court of Appeals for the D.C. Circuit (Saleh v. Titan Corp. 580 F.3d 1 (D.C. Cir. 2010), cert. denied, 131 S. Ct. 3055 (2011)), and is currently litigating similar issues in the Fourth Circuit. Other recent representations include first chairing a two-week ICC arbitration on behalf of a power plant contractor in Afghanistan and a government landlord in lease disputes involving the Americans with Disabilities Act.

In the antitrust arena, Mr. Zymelman has litigated for and provided counseling to plaintiffs and defendants on mergers, price discrimination, distribution issues, patent matters, and restraints of trade. 

Drawing on his work at the MITRE Corporation (researching Artificial Intelligence for the military), Mr. Zymelman has represented clients in matters involving a wide range of cutting-edge technology issues: software disputes, technology valuation, Internet and network related antitrust claims, biotechnology, pharmaceutical, and computer related patents.

Mr. Zymelman joined Williams & Connolly LLP in 1989, and has been a partner since January 1997.