Kathleen (Katie) M. O'Sullivan

Katie O'Sullivan has represented clients in a wide range of complex litigation in trial and appellate courts across the country. This work has involved diverse industries, including aviation, banking, biotechnology, food, manufacturing, retail, software, and telecommunications. At the trial court level, Katie has represented clients facing class actions pending in multi-district litigation and involving parallel state and federal investigations. She is also experienced at managing large electronic discovery teams, working with her clients to collect, efficiently review, and comprehend massive quantities of complex electronic data.

At the appellate level, Katie has worked on appeals across a broad spectrum of legal issues, including class certification, constitutional law, election law, employment law, product liability, and many other issues. In her role as Co-Chair of the Appellate Practice, she partners with other lawyers at Perkins Coie who have deep experience in the subject matter of the particular appeal.

Katie has been active in the Washington State Bar Association and the Federal Bar Associations, and in speaking to lawyers and judges on issues including appellate practice, class actions, judicial and legal ethics, and electronic discovery.

Professional Recognition

• Listed in The Best Lawyers in America, Commercial Litigation, 2009 - Present
• Listed in Washington Law & Politics, “Washington's Super Lawyers," 2007 - 2012

• Co-Recipient of awards for IOLTA Supreme Court litigation (American Bar Association, Washington State Bar Association, King County Bar Association, Perkins Coie)

Professional Leadership

• Washington Commission on Judicial Conduct, Lawyer Member 2007 - present; Chair (current)
• Appointed Ninth Circuit Appellate Lawyer Representative, 2010 - 2013
• Ninth Circuit Attorney Admission Committee, Member, 2009 - 2012
• Federal Bar Association for the Western District of Washington, Chair of Appellate Practice Committee, 2007 and 2008
• Washington State Bar Association, Board of Governors, 2003 - 2006, Liaison to Washington Young Lawyers Division and Washington Women Lawyers
• Elected to American Law Institute, Members Consultative Group, Principles of Aggregate Litigation and Principles of Elections Law

Community Involvement

• YMCA of Greater Seattle, Board Member (current)
• Perkins Coie Campaign for United Way of King County, Chair, 2009 - 2012 
• Leadership Tomorrow, Class of 2009
• Passages Northwest, Board Member, 2000 - 2003

Related Employment

• DNA – People’s Legal Services, Window Rock, Navajo Nation, AZ, Law Clerk, Summer 1994

Clerkships

• Hon. Harold H. Greene, U.S. District Court for the District of Columbia, 1996 - 1997
• Hon. M. Margaret McKeown, U.S. Court of Appeals for the Ninth Circuit, 1998 - 1999