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Jeanne Louise O'Brien

About me

Jeanne is a native of Massachusetts and received her BA from Wheaton College for Women in Norton MA. with a degree in Urban Studies. She graduated from Vermont Law School in 1986 and is actively licensed to practice law in Hawaii and California, and holds an inactive license in Massachusetts. Since July 2010 Jeanne has been practicing law in Thousand Oaks, California. Prior to that Jeanne had her own Estate Planning practice in Kona, Hawaii where she also served as a per diem Judge in the Third Circuit District and Family Courts for the State of Hawaii. Earlier in her career she was a litigator with the Law Offices of Melvin M. Belli and then had a solo practice in Monterey California.


Contact info

117 June Ct.
Thousand Oaks, CA, 91360

Practice areas


  1. Trusts: 40%
    29 years
  2. Estate Planning: 30%
    29 years
  3. Probate: 20%
  4. Elder Law: 5%
  5. Real Estate: 5%



Hourly ($250-300/hour), Fixed (sometimes)

Payment types:

Cash, Check, Credit card

Attorney endorsements

2 total 

Are you an attorney? Endorse this lawyer

  • No photo

    I endorse this lawyer. Attorney O'Brien asked me to handle the MA probate issues concerning her CA client. Her work is impeccable. She was clear, thorough, patient and very pleasant. She is a joy to work with. Her clients are indeed lucky to have her in their service.


    Helen Moreschi Employment and labor Attorney
    Relationship: Worked together on matter

  • Robert Morgan Triplett

    I endorse this lawyer. Jeanne truly cares about her clients well-being from a personal as well as a legal perspective. This sincere approach to client matters fosters a personal relationship based on trust, which is crucial when dealing with intimate personal family situations and finances. Jeanne's judicial training and experience gives her the patience, intelligence, and insight to proficiently assess issues and resolve them through the documents she drafts and the advice she renders. Jeanne is a most competent attorney and serves her clients well.


    Robert Triplett Trusts Attorney
    Relationship: Supervised lawyer


We have not found any instances of professional misconduct for this lawyer.
Avvo contributions
Legal answers
Work experience
TitleCompany nameDuration
AttorneyThe Law Offices of Robert M. Triplett2010 - 2011
Per Diem JudgeJudiciary State of Hawaii2005 - 2009
Senior AttorneyLaw Offices of Jeanne L. O'Brien2004 - 2010
AttorneyLaw Offices of Melvin M. Belli1994 - 1995
Association namePosition nameDuration
Women Lawyers of Ventura Countymember2011 - Present
Ventura County Bar AssociationMember2010 - Present
State Bar of Californiamember1994 - Present
Hawaii Bar AssociationMember1986 - Present
West Hawaii Bar Associationformer member1986 - Present
School nameMajorDegreeGraduated
Vermont Law SchoolLawJD - Juris Doctor1986
Harvard University Extension SchoolAdministration and Management MA programN/A1983
Wheaton College, Wheaton ILUrban StudiesBA - Bachelor of Arts1974
Speaking engagements
Conference nameTitleDate
West Hawaii Leadership InstituteFamily Law in the courts2009
Belli ConferenceU S Human Radiation Experiments litigation1994