James Yoon is a practice development leader of Wilson Sonsini Goodrich & Rosati's IP litigation department. James' practice focuses on patent litigation and IP counseling. James has more than 15 years of experience as an intellectual property litigator and counselor. He has litigated over 60 patent cases and has tried numerous cases in federal and state courts. In addition, he has tried numerous cases at the International Trade Commission.  James has an active IP counseling practice. He has advised over 40 companies on IP issues in a wide variety of transactions, ranging from patent licensing agreements and asset purchase agreements to initial public offerings (IPOs) and corporate mergers. James is frequently involved in IP risk assessments and valuations.

James is a member of the committee that developed the original and the revised Model Patent Jury Instructions for the Northern District of California. He is a lecturer at Stanford Law School and an adjunct professor at Santa Clara University School of Law, as well as a columnist on patent law and litigation for the ABTL Report of the Northern California Chapter of the Association of Business Trial Lawyers (ABTL).

In 2009, 2010, 2011, and 2012, James was selected for inclusion in Northern California Super Lawyers in the field of Intellectual Property Litigation. In 2006, Bay Area Lawyer Magazine named James one of the "Top Lawyers in the Bay Area" for Intellectual Property law.

James served as a law clerk to Chief Judge Alan C. Kay in the United States District Court for the District of Hawaii. He was also an electrical engineer for the General Motors Corporation, where he worked for many different operations, including the General Motors Technological Center (Warren, MI), Opel Motors (Russelsheim, Germany), Vauxhall Motors (Luton, England), and GM's Cadillac Assembly Plant (Detroit, Michigan).