Thaddeus J. "Thad" O'Sullivan

Missy Mordy is a top attorney recognized by Best Lawyers in the practice area(s) of Employment Law - Management and Litigation - Labor and Employment. Missy, who practices law in Bellevue, Washington, has been recognized since 2024. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Missy is held by other top lawyers in the same geographic and legal practice area.

Bonnie MacNaughton is a top attorney recognized by Best Lawyers in the practice area(s) of Commercial Litigation and Litigation - Intellectual Property. Bonnie, who practices law in Seattle, Washington, has been recognized since 2018. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Bonnie is held by other top lawyers in the same geographic and legal practice area.

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...

David K. Daggett is a top attorney recognized by Best Lawyers in the practice area(s) of Litigation - Intellectual Property. David K., who practices law in Seattle, Washington, has been recognized since 2021. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which David K. is held by other top lawyers in the same geographic and legal practice area.

Ross C. Siler is a top attorney recognized by Best Lawyers in the practice area(s) of Litigation - Health Care. Ross C., 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 Ross C. is held by other top lawyers in the same geographic and legal practice area.

Jeffrey Youmans is a top attorney recognized by Best Lawyers in the practice area(s) of Employment Law - Management and Litigation - Labor and Employment. Jeffrey, who practices law in Seattle, Washington, has been recognized since 2024. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Jeffrey is held by other top lawyers in the same geographic and legal practice area.

Daniel I.S.J. Rey-Bear is a top attorney recognized by Best Lawyers in the practice area(s) of Native American Law. Daniel I.S.J., who practices law in Spokane, Washington, has been recognized since 2015. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Daniel I.S.J. is held by other top lawyers in the same geographic and legal practice area.

Sue Morgan, a partner in the firm's Employee Benefits & Executive Compensation practice, advises clients on executive and equity compensation, corporate finance and securities, and insider trading compliance. Her representative clients include Boeing, Clearwire, Costco, Crocs, InfoSpace Inc., Intermec Technologies Corporation, Microsoft Corporation, Molex, Molson Coors Brewing Company and Weyerhaeuser. Sue frequently speaks on issues including executive compensation, option exchanges, ins...

Mike Reynvaan has 30 years of experience in the firm's Labor & Employment group. Mike has negotiated over 100 collective bargaining agreements, handled numerous grievance arbitrations and strikes, and has represented employers in connection with such issues from small owner-operated businesses, to some of the largest corporations in America. He routinely represents employers in litigation, class action and mediation, and regularly counsels clients in high exposure situations involving sen...

Bill Fleming practices in Keller Rohrback’s business group, where he focuses on estate and small business planning, charitable giving and trust and estate administration. Mr. Fleming is a graduate of Williams College and Harvard Law School. He formerly practiced with the New York City law firm of Simpson Thacher and Bartlett and the Seattle firm of Preston, Gates and Ellis.