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Michael J Costello

Workers compensation Attorney at Seattle, WA

5.0   1 review

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About Michael

Learn Michael’s areas of practice.

MICHAEL J. COSTELLO began practicing law at the The Walthew Law Firm in 1996 after graduating magna cum laude from Gonzaga Law School. Concurrent with his studies, he interned with Sims, Liesche, Newell, Reagan, Wallace and Wallace, P.A., in Coeur d’Alene, Idaho, and served as an Associate Editor of the Gonzaga Law Review from 1994 through 1996..


He is a member of the King County Bar Association, the American Bar Association, the National Organization of Social Security Claimants’ Representatives, Professionals in Workers’ Compensation, and an Eagle member of the Washington State Association for Justice.


His litigation practice includes the areas of Workers’ Compensation, Social Security Disability, and Personal Injury Law.

Licensed for 26 years
State WA
Status Active
Acquired 1996
Updated 11/25/2022

We have not found any instances of professional misconduct for this lawyer.

Contact Michael

The Walthew Law Firm
3000 1st Avenue
Seattle, WA, 98121


5.0 / 5.0
  1 customer review
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1 Star
Posted by Mike | October 11, 2019
This review is from a person who hired this attorney.
| Hired Attorney
The Best Counsel You Could Ask For!
After being injured on the job, I tried dealing with the employer first . After getting lied to numerous times, and having been blocked for treatment, I contacted Walthew. I was assigned Michael Costello, and met with him and Stephanie, the firm's Paralegal. They found numerous inconsistencies, and found that I was grossly underpaid, which led to recover of back time-loss. Mr Costello and Stephanie helped me navigate my claim, and were very diligent at getting in there to file disputes, etc., whenever needed. They were very attentive to my needs, which I greatly appreciate. They backed me up when the employer called me a liar (even though we had volumes of medical evidence), and set the employer straight when needed. Mr Costello and Stephanie stuck with me for many years, giving help and guidance along the way, and in the end, helped me secure my pension. They never wavered or lost focus. If you are injured at work, I highly recommend Michael Costello and Walthew. He is a super attorney!!
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  • Contingency 15%-33%


AVVO RATING 6.6 (Good)

Work Experience

  • Partner
  • The Walthew Law Firm
  • 1996 - Present


  • Gonzaga University School of Law
  • JD - Juris Doctor
  • 1996


  • Washington Associate for Justice
  • Eagle Member
  • 1996 - Present
  • King County Bar Association
  • Member
  • 1996 - Present
  • American Bar Association
  • Member
  • N/A
  • National Organization of Social Security Claimants Representatives
  • Member
  • N/A
  • Professionals in Workers' Compensation
  • Member
  • N/A
View all associations

Languages Spoken

  • English

Speaking Engagements

  • King County Bar Association
  • Social Security and its Effects on Workers' Compensation
  • 2009
  • WSTLA Annual Convention
  • Rating Permanent Partial Disability for Workers' Compensation Claims and Hearing Loss
  • 2003
  • Edmonds Community College People's Law School
  • Overview of Washington Workers' Comp and Social Security Disability
  • 2003
  • WSTLA Workers' Compensation
  • Working with the Self-Insured Administrator's Nurse Consultant
  • 2000
View all speaking engagements

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Seattle Workers compensation Lawyer Michael J Costello
Michael J Costello
Workers compensation Attorney
Seattle, WA
Licensed for 26 years