Before joining EFF, Opsahl worked at Perkins Coie, where he represented technology clients with respect to intellectual property, privacy, defamation, and other online liability matters, including working on Kelly v. Arribasoft, MGM v. Grokster and CoStar v. LoopNet. For his work responding to government subpoenas, Opsahl is proud to have been called a "rabid dog" by the Department of Justice. Prior to Perkins, Opsahl was a research fellow to Professor Pamela Samuelson at the U.C. Berkeley School of Information Management & Systems. Opsahl received his law degree from Boalt Hall, and undergraduate degree from U.C. Santa Cruz. Opsahl co-authored Electronic Media and Privacy Law Handbook.