Katharine Suominen Complex Commercial Litigation Lawyer- McDermott Will & Emery


Katharine Suominen represents clients in complex commercial litigation, investigations and regulatory proceedings. Her practice frequently involves the defense of US and international public accounting firms and professionals in a broad range of matters, including federal and state civil litigation, investigations and regulatory proceedings by the Securities and Exchange Commission (SEC), the Department of Justice (DOJ), the Public Company Accounting Oversight Board (PCAOB) and state regulators.

Katharine regularly consults and advises clients in connection with a variety of risk and compliance matters. Additionally, she represents companies and individuals in a wide range of white-collar and regulatory enforcement matters. She also has experience handling sensitive investigations, matters involving the False Claims Act and anti-bribery laws, including the Foreign Corrupt Practices Act (FCPA).

Show More


  • Represented Gulf Coast Health Care in five-day contested confirmation hearing resulting in the confirmation of Chapter 11 plan by Delaware bankruptcy court
  • Represented Quorum Health Corporation in five-day contested confirmation hearing; Delaware bankruptcy court confirmed Chapter 11 plan over equity holder objection
  • Represented the audit committee of a publicly-traded telecommunications company in connection with criminal and civil Foreign Corrupt Practices Act (FCPA) investigations and a related internal investigation.  The Department of Justice (DOJ) declined to prosecute the company, instead issuing a declination letter*

Show More


  • The Best Lawyers: Ones to Watch in America, Commercial Litigation, New York, 2024


  • American Bar Association, member
  • New York Bar Association, member


St. John’s University, JD, 2016
Union College, BA, 2010

United States District Court for the Eastern District of New York
United States District Court for the Southern District of New York

New York