An accomplished and renowned trial attorney, Brian Klein is known for fierce and successful advocacy for his clients in a wide variety of federal and state forums across the country. He is a former federal prosecutor who handles high-stakes civil litigation and criminal and regulatory defense matters, including those involving the DOJ, SEC, CFTC, FTC, CFPB, and state authorities.
Brian’s clients are successful entrepreneurs and professionals, fast growing and innovative companies, as well as larger companies facing existential legal threats, often with a focus on the technology and finance industries. Based on his accomplishments, Brian has been recognized as one of the nation’s top five financial technology attorneys, one of the top 100 attorneys in California, and Chambers has noted that he is “known as the guy you call when you get in trouble.
”A leading legal player in the technology and finance industries, Brian chairs the annual American Bar Association’s blockchain and digital currency national institute. He also speaks internationally about cutting-edge litigation issues involving NFTs, data privacy, cyber security, and financial technology, and for years has taught a federal criminal practice seminar at the USC Gould School of Law.
Brian is admitted to practice in the states of California, Washington, and New York and before numerous federal courts around the country, including the Central and Northern Districts of California and the Southern and Eastern Districts of New York, as well as the U.S. Supreme Court.
He graduated from New York University School of Law and received his undergraduate degree from the University of Washington.
- Representing Frances Haugen, the “Facebook Whistleblower,” including appearing with her when she testified before the U.S. Senate.
- Defended Arthur and Kathleen Breitman, as well as their company, in connection with securities class action lawsuits in San Francisco involving the Tezos crowdfunding, which raised over $230 million.
- Represented Block.one in connection with its settlement with the SEC in which it paid a $24 million penalty in connection with its $4 billion token sale.
- Defended Marcus Hutchins, who is known worldwide for stopping the “WannaCry” ransomware attack in May 2017, in a federal prosecution out of Milwaukee for cybercrimes from his youth. Marcus pleaded guilty, was sentenced to no prison time, and without precedent, the district court encouraged him to seek a pardon.
- Successfully defended a digital currency trader in federal court in Colorado against an unlicensed money transmitter criminal charge, securing dismissal of the case before trial.
- Obtained a complete acquittal at a jury trial in New York City for a boxer charged with assault with a deadly weapon in state court.
- Secured a no action letter from the SEC in connection with a years long investigation of a major digital token offering.
- Successfully handled the defense of Cesar Millan (the “Dog Whisperer”) when the Los Angeles County Department of Animal Control and District Attorney’s Office investigated allegations of animal abuse tied to one of Mr. Millan’s television shows. The authorities ultimately concluded Mr. Millan did nothing wrong and did not bring any charges.
- Obtained a declination to bring charges for a client from federal prosecutors in San Diego in a money laundering-related case.
- Represented Erik Voorhees, a prominent early Bitcoin adopter, in his settlement with the SEC in an investigation.
- Secured from the Los Angeles County District Attorney’s Office a declination to charge a high-profile client accused of sexual assault by someone the client met on a dating app.
- Represented a film production company in a Los Angeles-based federal action to enforce trademark rights that resulted in a settlement favorable to the client.
- Successfully defended a digital currency company in a state securities division investigation based out of the Midwest (no enforcement action was brought).
- Represented a U.S.-based technology company in a contract dispute with an Australian entertainment company that resulted in a settlement favorable to the client.
- Successfully defended a hazardous waste cleanup company facing multiple California state criminal charges, securing dismissal of all charges before trial.
Professional Associations and Memberships
- American Bar Association
- National Association of Criminal Defense Attorneys
- Los Angeles County Bar Association
- Partner Brian Klein to Speak on Trends In Cyber Enforcement at SoCal’s ABA White Collar Crime Committee, February 21, 2023
- Wall Street Journal Reports on Alleged Crypto Market Manipulation Scheme by Partner Brian Klein’s Client
- Partner Brian Klein Quoted About Notorious Gambler Suing Casinos From Prison
- Partner Brian Klein Named One of Daily Journal’s Top White Collar Attorneys 2022
- Waymaker LLP and Partner Brian Klein Earn Chambers 2023 FinTech Ranking
- Partner Brian Klein Speaks About Key Enforcement Actions at the ABA’s Blockchain and Cryptocurrency National Institute
- Brian Klein Quoted by the Wall Street Journal on Winning Probation for the Firm’s Client, the Alleged Capital One Hacker, Paige Thompson
- Four Partners and Waymaker Recognized in Benchmark Litigation California 2023
- Partner Brian Klein Named one of California’s Top 100 Lawyers by the Daily Journal
- Partner Brian Klein Named Fintech/Blockchain/Crypto Trailblazer 2022 by the National Law Journal
- Partner Brian Klein Quoted By Law360 about Cybersecurity Bill Authored by Sens. Lummis and Gillibrand
- Partners Keri Curtis Axel, Ryan Baker and Brian Klein Named Elite Boutique Trailblazers 2022 by the National Law Journal
- The Trial of Paige Thompson, the Alleged Capital One Hacker, is Underway with Brian Klein, Melissa Meister, and Emily Stierwalt Acting as Defense Counsel
- Partner Brian Klein Quoted By Law360 about the Ninth Circuit’s Recent Landmark Cybercrime Decision and Firm Client Paige Thompson
- Partners Teresa Huggins and Brian Klein Speak at 2022 TechGC’s Invitation Only Fullstack Conference
- Waymaker Client Dismissed in NFT Case Also Involving Sotheby’s and Artist Kevin McCoy
- Five Partners Named Southern California Super Lawyers 2022
- Partner Brian Klein Quoted By WSJ about a Federal Lawsuit involving a DeFi Protocol
- Partner Brian Klein Quoted By Law360 about Cybersecurity Developments to Watch in 2022
- Partner Brian Klein Quoted on NPR about Jury in US v. Elizabeth Holmes
- Partner Brian Klein Ranked By Chambers in Fintech for 2022
- Partner Brian Klein Quoted in Mercury News about US v. Elizabeth Holmes
- Three Partners and Waymaker Recognized in Benchmark Litigation California 2022
- Partner Brian Klein Profiled as a Law360 2021 Fintech MVP
- Partner Brian Klein Named One of the Nation’s Top 4 Fintech Lawyers by Law360
- Partner Brian Klein Chairs ABA Blockchain & Digital Currency Sept. 15 National Institute (Virtual)
- Partner Brian Klein Named One of the Top Crypto and Blockchain Attorneys By Business Insider
- Partner Brian Klein Quoted in CNN Article about why Trump CFO Allen Weisselberg might Cooperate with Prosecutors
- Waymaker Wins Motion To Dismiss First Crypto Antitrust Case
- Partner Brian Klein Quoted in New York Times story about Teenage Twitter Hacker Pleading Guilty