Masa Yamaguchi

Shareholder | Portland | 503.778.2174 |

Areas of Practice

Masa Yamaguchi focuses his practice in antitrust litigation and business law. He has worked on multinational antitrust investigations and class actions as well as licensing and other corporate matters.

Professional Experience

  • PacifiCorp — General Counsel’s Office, Legal Intern (2006-2008)
  • Lane Powell PC, Paralegal (2000-2004)
  • Okachi, Inc, Commodity Broker (1996-1998)

Admitted to Practice

  • Oregon


  • Lewis & Clark School of Law (J.D., 2008)
    • Business Law Certificate
    • Recipient of Research Fellowship Program
    • Minority Law Student Association, Member
  • Portland Community College (Paralegal Certificate Program, 2004)
  • Dokkyo University (B.A., French, 1996)

Practice Group and Specialty Team Memberships

  • Electronic Discovery, Technology and Strategy
  • Intellectual Property and Technology
  • International Business
  • Litigation
  • Electronic Discovery Committee
  • Antitrust and Trade Regulation

Awards and Honors

  • Named as an “Oregon Rising Star,” Super Lawyers® magazine, Antitrust Litigation (2017)

Professional and Community Activities

  • Vice Chair, Japan-America Society of Oregon (JASO)
    • Co-chair, Business Committee
  • Member, Oregon Minority Lawyers Association
  • Member, Oregon State Bar, Business Law Section
  • Member, Oregon Asian Pacific American Bar Association
  • Member, Multnomah Bar Association
  • Member, Shokookai (Japanese Business Alliance)
  • Member, American Bar Association, Antitrust Section


  • Japanese