Williams Kastner

20 Best Lawyers awards

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Awarded Practice Areas

Personal Injury Litigation - Defendants Litigation - Insurance Product Liability Litigation - Defendants
*Named the "Lawyer of the Year" in this practice area in the 2026 edition in Portland, OR.

Biography

Heidi Mandt is a Portland, Oregon–based attorney who focuses on civil litigation involving product liability, professional liability, toxic torts, and insurance defense. She represents clients in state and federal courts in matters involving personal injury, commercial disputes, and insurance coverage.

Heidi has tried more than twenty cases to verdict and has extensive courtroom experience handling claims involving product liability, medical and professional malpractice, and general liability.

Her practice also includes construction liability, breach of contract, catastrophic injury and wrongful death claims, and first-party and third-party insurance matters. She represents a wide range of clients, including individuals, retailers, construction companies, automotive and commercial vehicle manufacturers, and chemical companies.

Heidi has been recognized in The Best Lawyers in America® every year since 2017 and was named “Lawyer of the Year” for Personal Injury Litigation Defense in 2026.

Williams Kastner

20 Best Lawyers awards

Williams Kastner logo

Overview

  • Washington State University, Master of Healthcare Administration and Leadership (MHAL), graduated 2025
  • Willamette University, J.D., graduated 1995
  • Washington State University, B.S., graduated 1990

  • Oregon, Oregon State Bar
  • Washington, Washington State Bar Association
  • Idaho, Idaho State Bar

  • U.S. Court of Appeals 9th Circuit
  • U.S. District Court District of Oregon
  • U.S. District Court Eastern District of Washington
  • U.S. District Court Western District of Washington
  • U.S. District Court District of Idaho
  • Oregon, Oregon State Bar
  • Washington, Washington State Bar Association
  • Idaho, Idaho State Bar
  • Washington State University, Master of Healthcare Administration and Leadership (MHAL), graduated 2025
  • Willamette University, J.D., graduated 1995
  • Washington State University, B.S., graduated 1990
  • U.S. Court of Appeals 9th Circuit
  • U.S. District Court District of Oregon
  • U.S. District Court Eastern District of Washington
  • U.S. District Court Western District of Washington
  • U.S. District Court District of Idaho

Client Testimonials

Awards & Focus

Lawyer of the Year Badge - 2026 - Personal Injury Litigation - Defendants
Named "Lawyer of the Year" by Best Lawyers® for:
  • Personal Injury Litigation - Defendants, Portland, OR (2026)
Recognized in The Best Lawyers in America® 2026 for work in:
  • Litigation - Insurance
  • Personal Injury Litigation - Defendants
  • Product Liability Litigation - Defendants
Additional Areas of Practice:
  • Transportation Law

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