For more than 15 years, Kieran Ringgenberg has represented clients ranging from individual entrepreneurs to several of the world's most successful and respected businesses.



  • Obtaining a $50 million jury verdict for Oracle on software copyright infringement and computer abuse claims after more than five years of litigation, which led to entry of a judgment of more than $120 million.

  • Representing Apple in several matters, including as a member of the trial team in an antitrust class action, resulting in dismissal of the named plaintiff's claims in the middle of trial and then, after substitution of a new plaintiff, a complete defense verdict.

  • Successfully arguing for all defendants in a major antitrust class action a motion to dismiss on the eve of trial that resulting in judgment for all defendants.

  • Representing the founder of a software start-up against investors who took control of his company and fired him, ending in successful resolution after more than three years of litigation in federal and state courts.

  • Successfully arguing an appeal in a habeas corpus matter for the U.S. Court of Appeals for the Ninth Circuit, resulting in release of Kieran's client home to his family after 18 years of incarceration.


Kieran graduated magna cum laude from NYU Law School, where he served as Executive Editor of the NYU Law Review.

Immediately after law school, he served as law clerk to the Honorable Pasco M. Bowman of the United States Court of Appeals for the Eighth Circuit.

He practiced with several commercial law firms, including nearly fifteen years at Boies, Schiller & Flexner LLP, which the Wall Street Journal has called a “national litigation powerhouse,” and where Kieran was a partner until January 2016.  

Kieran is admitted to practice before the California Supreme Court, all the federal district courts in California (the Northern, Central, Southern, and Eastern Districts of California), the United States Court of Appeals for the Ninth Circuit, the United States Tax Court, and the United States Supreme Court.


Kieran lives in Piedmont, California with his wife and two children. When not practicing law, he can often be found in California’s beautiful Sierra, backpacking, fly-fishing, or snowboarding.

KIERAN RINGGENBERG  (510) 420-3846


(510) 420-3846


Kieran represented me for over three years through two lawsuits and counter lawsuits with a hostile board of directors. I consider myself very fortunate to have been represented by Kieran given the board hired a small army. Throughout it all, Kieran helped execute a legal strategy to build our claims with the evidence necessary for us to reach a successful settlement. With his top-notch legal skills and good judgement, the company, employees and shareholders came to a better place. Kieran was consistently responsive, helped us focus where it counted, wrote compelling claims and was a pleasure to work with.

— Founder/Shareholder Client