Derk Westermeyer

Derek is a senior partner in Keller Rohrback’s nationally recognized Complex Litigation Group and a member of the firm’s Executive Committee. Derek's passion for holding large corporations accountable for wrongdoing has helped recover billions of dollars for consumers, retirees, governments and institutions. He has served in leadership roles in major complex cases across the country. Currently, he is co-lead counsel in In re Facebook, Inc. Consumer Privacy User Profile Litigation ...

Kathleen M. O'Sullivan is a top attorney recognized by Best Lawyers in the practice area(s) of Appellate Practice, Bet-the-Company Litigation and Commercial Litigation. Kathleen M., who practices law in Seattle, Washington, has been recognized since 2009. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Kathleen M. is held by other top lawyers in the same geographic and legal practice area.

BACKGROUND As Managing Partner, Hayley brings a clear vision and collaborative leadership to the firm, guiding its strategic direction while continuing to serve clients with deep expertise in intellectual property (IP) law. She focuses on efficient and effective patent prosecution, licensing, and validity and infringement studies. With a background in electrical engineering, Hayley has successfully advised clients across a broad spectrum of technologies, including electrical, software, and me...

Eric M. Stahl is a top attorney recognized by Best Lawyers in the practice area(s) of Communications Law, Copyright Law, First Amendment Law and Media Law. Eric M., who practices law in Seattle, Washington, has been recognized since 2009. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Eric M. is held by other top lawyers in the same geographic and legal practice area.

Sarah K. Duran is a top attorney recognized by Best Lawyers in the practice area(s) of Artificial Intelligence Law. Sarah K., who practices law in Seattle, Washington, has been recognized since 2026. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Sarah K. is held by other top lawyers in the same geographic and legal practice area.

Marco de Sa e Silva is a top attorney recognized by Best Lawyers in the practice area(s) of Land Use and Zoning Law and Real Estate Law. Marco, who practices law in Bellevue, Washington, has been recognized since 2018. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Marco is held by other top lawyers in the same geographic and legal practice area.

Kelly H. Sheridan is a top attorney recognized by Best Lawyers in the practice area(s) of Commercial Litigation. Kelly H., who practices law in Seattle, Washington, has been recognized since 2026. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Kelly H. is held by other top lawyers in the same geographic and legal practice area.

Matthew D. LeMaster is a top attorney recognized by Best Lawyers in the practice area(s) of Corporate Law and Leisure and Hospitality Law. Matthew D., who practices law in Seattle, Washington, has been recognized since 2012. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Matthew D. is held by other top lawyers in the same geographic and legal practice area.

Nathan Julius is a top attorney recognized by Best Lawyers in the practice area(s) of Family Law. Nathan, who practices law in Seattle, Washington, has been recognized since 2026. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Nathan is held by other top lawyers in the same geographic and legal practice area.

Tom Boeder has more than 25 years' experience as a commercial litigator. His practice includes cases involving antitrust, antitrust clearance for mergers and acquisitions, class actions, consumer product liability and consumer protection litigation, and intellectual property litigation. A former deputy attorney general and chief of Antitrust, Consumer Protection and Criminal Law Enforcement in the Washington State Attorney General's Office, Tom has worked on a number of significant cases over...