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Location:Seattle, Washington



Email:E-mail Me

Michael J. Costello,


Michael J. Costello has chosen to devote his entire practice to workers’ compensation, Social Security disability, and personal injury cases. He became a partner in The Walthew Law Firm after graduating Magna Cum Laude from Gonzaga Law School in 1996. Prior to joining the firm, he was Associate Editor of the prestigious Gonzaga Law Review and interned with the Coeur d’Alene firm of Sims, Liesche, Newell, Reagan, Wallace and Wallace, P.A. He is a member of the Washington State  Association for Justice, American Bar Association, and the National Organization of Social Security Claimants’ Representatives.

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Areas of Practice

  • Personal Injury
  • Workers’ Compensation

Bar Admissions

  • Washington, 1996


  • Gonzaga University School of Law, Spokane, Washington

Professional Associations and Memberships

  • Washington State Bar Association
  • American Bar Association
  • Washington State Association for Justice, Eagle Member
  • King County Bar Association

Call us today.
Offices in Seattle and Everett.

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Mailing Address
PO Box 34645
Seattle, WA 98124-1645
*Packages and overnight deliveries should be shipped to the Seattle physical address.

Seattle Office
3000 1st Avenue
Seattle, WA 98121

Everett Office
2906 Colby Ave | Suite 101
Everett, WA 98201

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