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Keiko L. Sugisaka


Member of Firm Governance Committee
Chair of Tort & Product Liability Group
3300 Wells Fargo Center, 90 South Seventh Street, Minneapolis, MN 55402-4140

Bar Admissions

U.S. District Court
  • Colorado
  • Minnesota
U.S. Court of Appeals
  • Eighth Circuit
  • Ninth Circuit
  • Federal Circuit

Leadership & Community

  • Maslon LLP: Governance Committee Member 2019-present
  • Federal Bar Association – Minnesota Chapter: Board of Directors 2018-2021; Executive Committee, Grant Committee Co-Chair 2018-2019; Diversity Committee member
  • Minnesota Commission on Judicial Selection: At-Large Member 2016-2023
  • Fourth Judicial District Ethics Committee: Vice-Chair
  • Twin Cities Diversity in Practice: Maslon Member Representative
  • Twin Cities Habitat for Humanity: Board Member 2019-present
  • The Advocates for Human Rights: Pro Bono Attorney Volunteer
  • United States District Court for the District of Minnesota: The Asian Pacific Legal Experience in America exhibit, Committee Member
  • Women Presidents' Organization: Minnesota Chapter
  • Minnesota Women Lawyers
  • Minnesota Federal Court Open Doors Program
  • Minnesota Asian Pacific American Bar Association
  • Power of 100 Twin Cities Women Who Care: Member 2012-present
  • Twin Cities E-Discovery Forum
  • St. Paul Association for Community Soccer: past Board Member
  • Twin Cities Committee on Minorities in Large Law Firms: past Board Member
  • Theater Latté Da: past Board Member
  • Community Child Care Center: past Parent Board Member
  • Pro Se Project


Keiko Sugisaka is a trial lawyer, concentrating her practice primarily on product liability, complex business, and intellectual property cases, including consolidated and multi-district litigation. She has broad experience successfully representing clients in federal and state courts nationwide involving product liability defense; patent, trademark, and copyright infringement; director/officer liability; trade secret misappropriation; unfair competition; and commercial disputes. Keiko also has extensive experience in all stages of complex and large-scale discovery and e-discovery issues. At Maslon, Keiko serves on the firm's three-person Governance Committee, which manages the firm, and co-chairs its Tort & Product Liability Group. In addition, Keiko is a member of the firm's technology, recruiting, and diversity committees, and is Maslon's member representative in Twin Cities Diversity in Practice, a nonprofit association comprised of Twin Cities law firms and corporate legal departments whose vision is to create a vibrant and inclusive legal community.

Prior to joining Maslon, Keiko practiced intellectual property litigation with a large national law firm and was an Assistant Attorney General in the Minnesota Attorney General's Office where she enforced laws regulating nonprofit corporations, management of charitable assets, and litigating high-profile matters such as health care audits, insurance industry investigations, and fraud cases.

Keiko earned her law degree, cum laude, from the University of Minnesota Law School and earned her bachelor's degree, cum laude, with a double major in speech communication and law and society from Macalester College. She also completed a judicial clerkship with Justice Alan C. Page of the Minnesota Supreme Court (1996-1997).


  • In re American Medical Systems, Inc., CV-11-3933 (Hennepin County District Court, Minnesota). Defended consolidated state court actions alleging multiple tort theories against American Medical Systems related to female mesh products.
  • Represents world-leading medical device company in nationwide litigation involving PMA and 510k devices.
  • Thomsen v. Famous Dave's of America et al., 606 F.2d 905 (8th Cir. 2010). Defended $10 million copyright infringement and breach of contract action brought by former sign painter and restaurant designer for defendant Famous Dave's. District Court dismissed case on summary judgment, which was upheld on appeal.
  • U.S. Bancorp. v. Mitgang et al. (Minn. Ct. App.). Appellate counsel for plaintiff in $1 million breach of contract action. Obtained complete reversal of summary judgment on appeal with appellate court ordering grant of summary judgment in favor of plaintiff.
  • Part of team representing design engineers for litigation following collapse of I-35W Bridge in Minneapolis; obtained interlocutory appellate review of district court decisions involving statute of repose.
  • Indiezone, Inc. et al. v. Rooke et al. (N.D. Cal. 2013). Lead trial counsel successfully defending 17 defendants, as well as indemnified parties including two of the world's largest retailers, a national bank and technology company, against a 27-count complaint brought by domestic and international plaintiffs alleging over $1 billion in damages for trade secret misappropriation, civil RICO, copyright and trademark infringement, and state law claims. Obtained an order dismissing one plaintiff for lack of standing and requiring the remaining plaintiff to arbitrate against certain defendants and stay the litigation pending arbitration. Prior to arbitration, successfully moved the court to vacate the arbitration order, dismiss the entire lawsuit with prejudice as to all defendants, and award attorneys' fees, which was affirmed on appeal.

Other Selected Case Results

  • Trial and appellate counsel in defense of an alleged $500 million theft of trade secret, breach of fiduciary duty and breach of contract case. The district court dismissed the case on summary judgment, which was affirmed on appeal.
  • Trial counsel for plaintiff in action for theft of trade secrets involving an Olympic hospitality business for the 2004 Summer Olympics in Athens. Obtained a temporary injunction and case settled thereafter including a permanent injunction.
  • Trial counsel for plaintiffs in patent infringement action for web browser technology for interactive applications embedded in web pages. Jury verdict returned in favor of plaintiffs on issues of infringement, validity, and damages in the amount of $520.6 million, with final judgment, including prejudgment interest, in an amount over $565 million. On appeal, the Federal Circuit affirmed infringement and damages and ordered remand on invalidity and inequitable conduct defenses. Case settled prior to invalidity retrial.


2021 Notable BIPOC Executive, Twin Cities Business (Notable BIPOC Executive is a designation that recognizes individuals for their ability to effect change, their willingness to share expertise, and their leadership in specific initiatives or programs at their companies or institutions that have created significant, positive, and measurable results.)

2017 Women in Business Award Winner, Minneapolis/St. Paul Business Journal

Pro Bono All Star, Minnesota State Bar Association, 2020 (Pro Bono All Star is a designation that recognizes MSBA members who have been recognized as North Star Lawyers for seven or more years.)

North Star Lawyer, Minnesota State Bar Association, 2014-2019 (North Star Lawyer is a designation that recognizes members who provide 50 hours or more of pro bono legal services in a calendar year.)

Recognized on Minnesota Super Lawyers® list, 2017-2021 (Minnesota Super Lawyers® is a designation given to only 5 percent of Minnesota attorneys each year, based on a selection process that includes the recommendation of peers in the legal profession.)

Top Women Attorneys in Minnesota® list, 2018-2019 (The annual edition of the Top Women Attorneys in Minnesota list features attorneys who received the highest point totals in the previous year's Minnesota Super Lawyers® and Rising Stars balloting, research, and blue ribbon review process.)

Selected for inclusion in The Best Lawyers in America®, 2021-2022

Recognized on Minnesota Rising Stars list as part of the Super Lawyers® selection process, 2004, 2009, 2011 (Minnesota Rising Stars is a designation given to only 2.5 percent of Minnesota attorneys each year, based on a selection process that includes the recommendation of peers in the legal profession.)

March 10, 2020
August 2, 2019
+ View All Presentations View All Presentations
January 11, 2019
January 1, 2009
January 1, 2003


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