Erika A. O'Sullivan

Carl Crow, a Partner in Perkins Coie's Federal Tax Group, focuses his practice on taxable and tax-free mergers, acquisitions, spin-offs and separations, debt and equity financings, leveraged buyouts, intellectual property transfers, international business transactions, partnership and limited liability company formations, executive compensation, and the taxation of special entities, such as S corporations, master limited partnerships, and international shipping companies.

Robert J. Maguire is a top attorney recognized by Best Lawyers in the practice area(s) of Commercial Litigation. Robert J., who practices law in Seattle, Washington, has been recognized since 2013. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Robert J. is held by other top lawyers in the same geographic and legal practice area.

Erin Blower is a top attorney recognized by Best Lawyers in the practice area(s) of Family Law. Erin, who practices law in Seattle, Washington, has been recognized since 2025. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Erin is held by other top lawyers in the same geographic and legal practice area.

Jason Froggatt practices employee benefits law, advising clients on employee retirement plans, plan qualification and plan fiduciary duties. He works extensively on equity-based compensation, including establishing stock option and employee stock ownership plans. Jason regularly counsels group health plans and their plan sponsors with respect to ERISA, COBRA and HIPAA compliance, and represents employee plans and plan sponsors with the Department of Labor and the Internal Revenue Service.

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 ...

Cory Claassen brings over 20 years of patent law experience to his practice, focusing on the preparation and prosecution of U.S. and foreign patents in the electrical, optical, and mechanical fields. Cory’s practice extends to patent infringement and validity opinions, patent portfolio management, and intellectual property strategy and counseling. He provides these services to clients across a diverse array of technologies, including semiconductor devices, electronics, display and imagi...

Tahl Tyson is an international employment law partner at Littler with over 25 years of practice. She is a US-based UK solicitor, and is also admitted to practice in the US. She advises employers on UK and cross-border employment matters. Tahl was in-house global employment counsel and a member of the HR senior leadership team for a global publicly traded company, where she advised on workplace issues spanning 40 countries. While resident in the company’s Paris office, she provided site ...

Tyler moved to Seattle in 2007 and became a partner of Harrigan Leyh Farmer & Thomsen LLP in 2010. He co-founded Martinez & Farmer LLP in 2025. Chambers USA, Best Lawyers in America (Appellate, Commercial Litigation, Intellectual Property), Benchmark Litigation, Super Lawyers (Top 100), and Martindale-Hubbell rank Tyler among the top trial lawyers in the state. He is a Fellow of the American Bar Foundation, Fellow of Litigation Counsel of America and included on America’s Top 10...

Professional Experience Rich’s practice focuses on businesses and individuals in disputes with the Internal Revenue Service and the Washington State Department of Revenue. Prior to joining Helsell Fetterman, Rich was a partner at LeSourd & Patten. In addition to his practice, Rich teaches a course in federal tax procedure in the Masters of Science in Taxation (MSTax) program at the University of Washington, Michael G. Foster School of Business. Typical cases include: Representing ta...

BACKGROUND Lorraine received a B.S. in Aeronautical and Astronautical Engineering from the University of Washington and her J.D. from the University of Washington School of Law. EXPERIENCE Lorraine specializes in domestic and foreign patent protection in the mechanical and aeronautical fields. She assists clients in both utility and design patent procurement and enforcement, strategic planning, patentability, validity and infringement opinions, and conflict resolution. Lorraine has worked wit...