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Professional Biography

Kathleen (Katie) M. O'Sullivan Partner

Firmwide Chair, Commercial Litigation Practice; Member, Firmwide Executive Committee

  • Seattle

    D +1.206.359.6375

    F +1.206.359.9000

    Seattle

    1201 Third Avenue, Suite 4900

    Seattle, WA

    +1.206.359.6375

    KOSullivan@perkinscoie.com

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OVERVIEW

EXPERIENCE

NEWS

News
  • 12.15.2016
    Perkins Coie Names Three Partners to Leadership Positions
    Press Releases
    Perkins Coie is pleased to announce that it has appointed three partners to leadership positions – two of whom will lead national practice groups. Katie O’Sullivan was named chair of the firm’s national Commercial Litigation practice; Karen McGaffey was named chair of the firm’s national Environment, Energy and Resources (EER) practice; and Cori Gordon Moore was named leader of the firm’s Commercial Litigation practice in Seattle.
  • 08.15.2016
    Best Lawyers® 2017 Recognizes 252 Perkins Coie Attorneys
    Press Releases
    Perkins Coie is proud to announce that 252 of its attorneys were selected by their peers for inclusion in the 2017 edition of The Best Lawyers In America®, the oldest and most respected peer-review publication in the legal profession.
  • 05.16.2016
    Perkins Coie Attorneys Mentioned in Law360 - 9th Circ. Affirms Jet Financier's $8M Win Against Cargo Co.
    General News

    Law360

    Perkins Coie attorneys were mentioned as counsel in "9th Circ. Affirms Jet Financier's $8M Win Against Cargo Co.," a Law360 article, regarding damages suffered by Global BTG LLC after National Air Cargo Inc. backed out of a letter of intent, which also quoted partner Don Kula.
  • 03.02.2016
    Perkins Coie Names Four Seattle Partners to Leadership Positions
    Press Releases
    Perkins Coie is pleased to announce that four Seattle-based partners have been appointed to leadership positions in the firm.  David McShea has been appointed as the Chair of the firm’s Executive Committee, succeeding Laura Neebling, a 26-year veteran of the firm who recently retired.  Katie O’Sullivan has been appointed to lead the firm’s Commercial Litigation practice in Seattle, which includes more than 70 lawyers. 
  • 08.17.2015
    35 Perkins Coie Attorneys Named 2016 Lawyers of the Year by Best Lawyers®
    Press Releases
    Perkins Coie is proud to announce that 35 of its attorneys have been named 2016 Lawyers of the Year by Best Lawyers®, the oldest and most respected peer-review publication in the legal profession.
  • 08.17.2015
    Best Lawyers® 2016 Recognizes 245 Perkins Coie Attorneys
    Press Releases
    Perkins Coie is proud to announce that 245 of its attorneys were selected by their peers for inclusion in the 2016 edition of The Best Lawyers In America®, the oldest and most respected peer-review publication in the legal profession; a more than 10 percent increase over the 221 firm attorneys recognized by Best Lawyers in the 2015 edition.
  • 05.21.2015
    Perkins Coie Partner Kathleen O’Sullivan Elected to the American Law Institute Council
    Press Releases
    Katie O’Sullivan, partner and co-chair of Perkins Coie’s Appellate practice, has been elected to the Council of The American Law Institute (ALI).
  • 08.18.2014
    Best Lawyers® 2015 Recognizes 221 Perkins Coie Attorneys
    Press Releases
    Perkins Coie is proud to announce that 221 of its attorneys were selected by their peers for inclusion in the 2015 edition of The Best Lawyers In America®,  the oldest and most respected peer-review publication in the legal profession.
  • 02.25.2014
    Perkins Coie Launches Food Litigation News
    Press Releases
    Perkins Coie is proud to announce the launch of Food Litigation News, a new blog focused on food and beverage labeling and nutritional content law.  Food Litigation News shares timely insights into litigation developments, emerging arguments and legal challenges facing food and beverage manufacturers and related industries.
  • 08.21.2013
    Best Lawyers 2014 Recognizes 206 Perkins Coie Attorneys
    Press Releases
    Perkins Coie is proud to announce that 206 of its attorneys were selected by their peers for inclusion in the 2014 edition of The Best Lawyers In America®.
  • 03.2013
    Perkins Coie Helps Boeing Win Dismissal of Securities Class Action
    Press Releases
    A Perkins Coie team scored a victory for Boeing in a securities class action over the 787 Dreamliner’s first flight.  In a unanimous opinion authored by Judge Richard Posner, the U.S. Court of Appeals for the Seventh Circuit affirmed dismissal of the complaint and remanded to the district court for the limited purpose of determining whether plaintiffs’ attorneys, the Robbins Geller law firm, violated Rule 11.
  • 10.15.2012
    Perkins Coie Secures Victory in Ninth Circuit First Amendment Case
    Press Releases
    The Ninth Circuit Court of Appeals ruled today in favor of Perkins Coie clients Dex Media West, Inc., SuperMedia LLC, and the Local Search Association in Dex Media West v. City of Seattle, No. 11-35787.
  • 09.12.2012
    197 Perkins Coie Lawyers Recognized In 2013 Best Lawyers
    Press Releases
    Perkins Coie is proud to announce that 197 of its attorneys were selected by their peers for inclusion in the 2013 edition of The Best Lawyers in America®.  Thirty-five attorneys were listed this year for the first time, representing a 22 percent increase in the number of Perkins Coie attorneys who appeared in the 2012 edition.
  • 08.31.2011
    The Best Lawyers in America Recognizes 163 Perkins Coie Lawyers
    Press Releases
    Perkins Coie is proud to announce that 163 of its attorneys throughout the country were selected by their peers for inclusion in the 2012 edition of The Best Lawyers in America® (Copyright 2011 by Woodward/White, Inc., of Aiken, S.C.).
  • 08.13.2010
    The Best Lawyers in America Recognizes 143 Perkins Coie Lawyers
    Press Releases

    Perkins Coie is proud to announce that 143 of its attorneys throughout the country were selected by their peers for inclusion in the 2011 edition of The Best Lawyers in America (Copyright 2010 by Woodward/White, Inc., of Aiken, S.C.).

  • 06.09.2010
    90 Perkins Coie Attorneys Named Super Lawyers
    Press Releases
    Ninety Perkins Coie attorneys have been honored by their peers as "Washington Super Lawyers" for 2010. Nine were named to the Top 100 list and four were named to the Top 50 Women list. The list of Super Lawyers is published in the June edition of Washington Law & Politics magazine.
  • 10.02.2009
    Appellate Co-Chairs Featured in Law360 Q&A Articles
    General News
    Perkins Coie's Appellate Practice Co-Chairs Dan Bagatell and Katie O'Sullivan were featured recently in separate Q&A articles posted on Law360's new Appellate section. They discussed their most challenging cases, expressed opinions about the biggest problems with the U.S. appeals process, and gave advice for young lawyers, among other discussion topics.
  • 08.03.2009
    The Best Lawyers in America Recognizes 141 Perkins Coie Lawyers
    Press Releases
    Perkins Coie is proud to announce that 141 of its attorneys across the country were selected for inclusion in the 2010 edition of Best Lawyers of America.
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PUBLICATIONS & PRESENTATIONS

RELATED INFORMATION

Areas of Focus

Bar and Court Admissions

  • Washington

  • Supreme Court of the United States

  • U.S. Court of Appeals for the Fourth Circuit

  • U.S. Court of Appeals for the Seventh Circuit

  • U.S. Court of Appeals for the Ninth Circuit

  • U.S. District Court for the Eastern District of Washington

  • U.S. District Court for the Western District of Washington

Education

  • Georgetown University Law Center, J.D.,
    cum laude
    ,
    Senior Notes Editor, Georgetown Law Journal
  • Yale University, B.A., History,
    cum laude

Highlights

Best Lawyers Award Badge