Katherine M. Aizpuru

Katherine M. Aizpuru is a Partner in Tycko & Zavareei LLP’s Washington, D.C. office. Her practice focuses on protecting consumers and whistleblowers from fraudulent and unfair practices. Ms. Aizpuru has fought predatory financial institutions and mortgage servicers that wrongfully took money from consumers, service providers that snuck junk fees into their invoices, and tech companies that violated user privacy. She has also represented whistleblowers who exposed illegal practices in the healthcare industry. Ms. Aizpuru has taken on some of the world’s most prominent corporations and financial institutions and has recovered millions of dollars for consumers.

Before joining Tycko & Zavareei LLP as a partner in 2024, Ms. Aizpuru litigated on behalf of consumers in the Federal Trade Commission’s Division of Financial Practices. There, she led the FTC’s first ever case against a cryptocurrency company and its former executives. She also secured settlements that shut down a pair of student debt relief scams, required the defendants to turn over their assets—including personal bank accounts, vehicles, and properties—for consumer redress, and banned the principals from working in the debt relief industry. Ms. Aizpuru’s other work at the FTC included investigations involving fair lending, dark patterns, and unfair and deceptive practices in the fintech and auto sales industries. Ms. Aizpuru also served as a trial attorney at the Department of Justice, where she represented federal agencies, such as the U.S. Section of the International Boundary and Water Commission, the Kennedy Center for the Performing Arts, and the Defense Health Agency, in complex litigation and bankruptcy proceedings.

Ms. Aizpuru was an associate at Tycko & Zavareei LLP from 2017 to 2021. She earned her law degree cum laude from Harvard Law School and clerked for the Honorable Catharine F. Easterly on the District of Columbia Court of Appeals and the Honorable Theodore D. Chuang on the U.S. District Court for the District of Maryland. She also practiced law in the Washington, D.C. office of a large international law firm, where she was recognized for her pro bono work. Prior to law school, Ms. Aizpuru graduated with a Bachelor of Arts with High Honors from Swarthmore College.

Ms. Aizpuru lives in Maryland with her family. She trains and competes in powerlifting, and enjoys jogging, golfing, pickleball, and tennis—none particularly well, but all with great enthusiasm. She is a voracious reader and audiobook evangelist.