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About me

I am the founder of South King County's largest law firm, and have served as a Managing Partner for all of its existence.  I conceived the firm as having Seattle/Bellevue law firm image and quality, but with the convenience and reasonable fees permitted by a Kent location.  The firm is now approaching its tenth anniversary; with eighteen lawyers - the experiment was a success!  I believe the lawyers in this firm are among the finest there are in the State.


I have over 36 years of legal experience, nearly all of it in a Partner/Leader capacity.  My own practice emphasizes the representation of municipalities, builders, developers and businesses in land use, commercial, construction, governmental and litigation matters.


I have substantial court and trial experience, including personal injury and criminal jury trials, commercial litigation, matters in the State Courts of Appeals and Supreme Court; and Federal trial and Appellate matters.  Although I still end up in Court a fair amount, more recently my cases tend to be resolved with Mediation, which I have found to be a very effective method to get my clients the best possible results at a reasonable cost. 


I am regularly appointed by the King County Superior Court as an Arbitrator, and after hearing and deciding many such cases, I don't believe I have ever been appealed by the litigants.


I am married to Peggy and we have four sons - two of whom are fine attorneys with the firm.  My personal interests are photography, boating (we have a big, old Chris Craft), motorcycling (a big, old Harley), traveling, and eleven grandkids.


Languages spoken: Finnish

Photos and videos

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Practice areas


  1. State, Local And Municipal Law: 35%
    39 years, 400 cases
  2. Construction & Development: 35%
    38 years, 100 cases
  3. Litigation: 20%
    39 years, 300 cases
  4. Commercial: 10%
    39 years, 100 cases


Payment types:

Cash, Check, Credit card

Attorney endorsements

8 total 

Are you an attorney? Endorse this lawyer

  • Colette M Kostelec

    Mike is the general counsel for a water & sewer district that I represented on a complex litigation case. Mike protected his client's interests diligently and I very much appreciated his responsiveness and insightful comments during the litigation. Highly recommended.


    Colette Kostelec Land Use & Zoning Attorney
    Relationship: Worked together on matter

  • Greg W. Haffner

    I have known Mike for more than 10 years and worked with him in the community frequently during that time. Mike is highly regarded, both as a volunteer and as an attorney.


    Greg Haffner Business Attorney
    Relationship: Fellow lawyer in community

Contact info

Hanis Irvine Prothero, PLLC

6703 South 234th Street
Suite 300
Kent, WA, 98032-2903


We have not found any instances of professional misconduct for this lawyer.
Avvo contributions
Legal answers
Award nameGrantorDate granted
Avvo 2012 Clients' Choice AwardAvvo2012
Avvo Featured Attorney - State and Local LawAvvo2012
Editor: "Annexations, Incorporation, and Boundary Review Boards”WSBA Environmental Land Use Section2011
Pro Bono Publico Service CommendationWashington State Bar Association2006
Thirty Year MembershipWashington State Bar Association2005
Work experience
TitleCompany nameDuration
Attorney and a Managing PartnerHanis Irvine Prothero PLLC2007 - Present
Court Appointed Arbitrator - 20+ casesKing County Superior Court Arbitrations2004 - Present
Attorney and Managing PartnerHanis Greaney Prothero, PLLC2003 - 2007
FounderHanis Irvine Prothero (predecessor)2003 - 2003
Partner AttorneyHanis & Olson1980 - 2003
Partner AttorneyHarpold, Hanis & Fiori1978 - 1980
Associate AttorneyBonjorni, Harpold & Fiori1976 - 1978
Association namePosition nameDuration
Kent Homeless Shelter Task ForceN/A2012 - Present
WSBA Business Law SectionMember2006 - Present
Kent Downtown Business PartnershipExecutive Board - Past President2005 - Present
ABA Law Practice Management SectionMember2000 - Present
Washington State Bar Association, Environmental and Land Use Law SectionMember1995 - Present
Washington Assoc. Sewer & Water DistrictsMember of Attorneys Group1985 - Present
American Bar AssociationMember1980 - Present
King County Bar AssociationMember1976 - Present
Legal cases
Case nameOutcome
Balzer v. Dewitt$544,000, plus interest and costs
See all legal cases 
Publication nameTitleDate
WSBA Environmental and Land Use Law SectionEditor of Real Property Deskbook - “Annexations, Incorporation, and Boundary Review Boards”2012
Utility Contractor Association of WashingtonNegotiating Claims With Public Owners - Psychology 1012006
School nameMajorDegreeGraduated
Willamette University College of LawLawJD - Juris Doctor1975
Brigham Young UniversityBusiness ManagementBS - Bachelor of Science1972
Speaking engagements
Conference nameTitleDate
Washington State Legislature, House Local Governance Committee HearingsWater and Sewer District Industry Legislative Agenda - testimony2013
Washington State Legislature Senate Local Governance Committee HearingsMunicipal Water and Sewer District Legislative Agenda - testimony before Senate Committee2013
Kent Downtown Partnership Annual DinnerMaster of Ceremonies2011
Kent Downtown Business Partnership Qtly BreakastKeynote2011
KCBA New Lawyer OrientationDeveloping Legal Contacts2008
WASWD Annual Educational ConferenceLegal Issues Re: Collection and Enforcement of Water and Sewer Service Charges2005
Washington Association of Boundary Review Boards Annual ConferenceLegal Issues Related to the Assumption of Special Purpose Districts by Cities2005
WASWD Annual Educational ConferenceReport on Participation at Eastern Europe Infrastructure (Water and Sewer) Conference (Budapest)2002