Katherine M. Turner

Katherine Turner Photo

Katherine Turner focuses her practice on complex civil litigation and government investigations.  She has represented corporations, professional firms, and individuals in a broad range of cases in federal and state courts, at both the trial and appellate levels, and in arbitration proceedings before JAMS and FINRA. 

Katherine has significant experience in professional liability defense in cases involving accounting firms.

Katherine has also represented an array of other clients in complex civil litigation in a number of other substantive areas, including securities litigation, Lanham Act claims, and commercial contract disputes.

Katherine was born and raised near Philadelphia, Pennsylvania and graduated from Georgetown University, summa cum laude, in 2001.  She received her J.D., cum laude, from the Harvard Law School and was an editor of the Harvard Law Review.  She joined Williams & Connolly in 2005, after serving as a law clerk to the Honorable Bruce Marshall Selya of the United States Court of Appeals for the First Circuit.  Katherine is a Co-Chair of the firm’s Women’s Initiative and a member of the Hiring Committee.

Representative Experience

  • Representation of a national accounting firm in the defense of several audit malpractice actions arising from the Petters and Madoff frauds
  • Representation of a national accounting firm in PCAOB and SEC investigations
  • Representation of several interdealer brokers in disputes with their former employer in series of FINRA arbitrations
  • Representation of a national accounting firm in the successful appeal of a trial verdict in which the jury had found liability to a non-client arising from an audit



“40 & Under Hot List”, Benchmark Litigation, 2017-2018

“Top 250 Women in Litigation,” Benchmark Litigation, 2016-2018

"Local Litigation Star," Benchmark Litigation, 2017-2019

Selected to Washington, D.C. “Rising Stars” list, Super Lawyers, 2014-2019


Other Government Service

Law Clerk, Judge Bruce M. Selya, United States Court of Appeals for the First Circuit, 2004-2005

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