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About me

Our lawfirm represents individuals and families in state, federal, and bankruptcy courts, who have been victimized by corporations in the areas of consumer finance, foreclosure, predatory lending, fraud, and real estate purchases. We also assist persons in estate planning, probate and general civil matters.





Washington State Bar

Federal Bar Association

United States Supreme

United States Claims Court

Ninth Circuit Court of

Eighth Circuit Court of

Seventh Circuit Court of

United States District
Court, Delaware

United States District
Court, Washington

United States District Court,
E. D. Wisc.

Swinomish Tribal Court


Photos and videos

3479 1219435425

Practice areas


  1. Real Estate: 34%
    38 years
  2. Litigation: 33%
    38 years
  3. Bankruptcy: 26%
    23 years
  4. Estate Planning: 7%
    20 years


Payment types:

Check, Credit card

Attorney endorsements

6 total 

Are you an attorney? Endorse this lawyer

  • Christopher E. Green

    David is one of the best, most experienced attorneys in Seattle and one of the top consumer protection attorneys in the country. Recipient of the prestigious Countryman Award by the National Consumer Law Center. The top name in mortgage litigation.


    Christopher Green Consumer protection Attorney
    Relationship: Worked together on matter

  • Matthew F. Davis

    David is the go-to guy on real estate financing questions. No one else on my list.


    Matthew Davis Business Attorney
    Relationship: Worked together on matter

Contact info

Leen & O'Sullivan, PLLC

520 East Denny Way

Seattle, WA, 98122-2138


We have not found any instances of professional misconduct for this lawyer.
Avvo contributions
Legal answers
Award nameGrantorDate granted
Super LawyerLaw & Politics Magazine2014
Super LawyerLaw & Politics Magazine2013
Super LawyerLaw & Politics Magazine2012
Vern Countryman Award for ExcellenceNational Consumer Law Center, Boston2012
Super LawyerLaw & Politics Magazine2011
Seattle's Top LawyersLaw & Politics Magazine2010
Super LawyerLaw & Politics Magazine2009
Seattle's Top LawyersLaw & Politics Magazine2008
Super LawyerN/A2006
Super LawyerN/A2005
Seattle's Top LawyersN/A2005
Super LawyerN/A2004
Pro Bono Attorney of the YearN/A2004
Super LawyerN/A2003
Super LawyerN/A2002
Super LawyerN/A2001
Quiet Hero AwardN/A2000
Reginald Heber Smith FellowshipN/A1973
Reginald Heber Smith FellowshipN/A1972
Reginald Heber Smith FellowshipN/A1971
Work experience
TitleCompany nameDuration
MemberLeen & O'Sullivan, PLLC1980 - Present
Association namePosition nameDuration
Northwest Consumer Law CenterBoard President2012 - Present
National Association of Consumer AdvocatesFounding Member1996 - Present
King County Mandatory Arbitration PanelMember1985 - Present
Legal Foundation of WashingtonBoard of Trustees2000 - 2004
Legal cases
Case nameOutcome
State of Washington v. BrumfieldPrior conviction vacated and client aquitted
Cox v. Helenius, 103 Wn.2d 383 (1985)Foreclosure vacated for trustee misconduct
Whitehead v. DerwinskySuccessfully challenged VA deficiency claims
See all legal cases 
Publication nameTitleDate
Wrongful Foreclosures in WashingtonGonzaga Law Review2014
Washngton State Bar AssociationForeclosure Defenses2012
Law Seninars InternationalForeclosure Ethics2011
National Business Institute SeminarForeclosure Defenses2010
Washington State Bar CLE publicationForeclosure Defenses2008
Washington State Bar AssociationReal Estate Loan Defaults and Workouts1989
National Lawyers Guild QuarterlyEconomics of Consumer Law Practice1982
Oregon Law ReviewFuller v. Oregon: The Cost of a Constitutional Right1976
Washington Bar JournalDeed of Trust Foreclosures in Washington1975
Washington Law ReviewDeeds of Trust and Due Process1973
School nameMajorDegreeGraduated
University of Oregon School of LawLawJD - Juris Doctor1971
Beloit CollegeSocial ScienceBA - Bachelor of Arts1968
Speaking engagements
Conference nameTitleDate
Real EstateForeclosure Defenses2013
Foreclosure CLEDefending Foreclosures2011
Law Seminars InternationalAdvanced Workshop on Real Estate Remedies2003