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Martin Osinski

About me

I am the founding partner of the law firm of Law Firm of Martin Osinski, LLC and represent clients in all aspects of Family and Matrimonial Law, including divorce, child support, visitation, maintenance, division of assets, child custody, and parentage.  I have handled numerous difficult dissolution of marriage actions involving complex financial and child custody issues and routinely partner with financial advisors and mental health professional to provide comprehensive representation to my clients.  I am a frequent lecturer on Family Law issues and have conducted numerous local and national radio interviews on family law issues.


Languages spoken: English, Polish

Photos and videos

1078068 1378328706

Practice areas


  1. Divorce: 40%
    13 years
  2. Child Custody: 25%
    13 years
  3. Child Support: 25%
    13 years
  4. Prenuptials: 10%
    13 years



Hourly ($250-350/hour), Free consultation (60 minutes)

Payment types:

Cash, Check, Credit card

Attorney endorsements

29 total 

Are you an attorney? Endorse this lawyer

  • Mark V. Clay

    I highly endorse Mr. Osinski. Truly exceptional and caring attorney who produces great results in representing clients! I want all people to contact him for help.


    Mark Clay Immigration Attorney
    Relationship: Fellow lawyer in community

  • Jeffrey Morris Jacobson

    I endorse this lawyer. Marty is an excellent, hard working and highly experienced attorney.


    Jeffrey Jacobson Divorce & Separation Attorney
    Relationship: Supervised lawyer

Contact info

Law Firm of Martin Osinski, LLC

180 W. Washington, Suite 400
Chicago, IL, 60602-1192


ILActive And Authorized To Practice Law200211/12/2015
We have not found any instances of professional misconduct for this lawyer.
Avvo contributions
Legal answers
Award nameGrantorDate granted
Top ContributorAvvo2013
Excellent RatingAvvo2013
Business Valuation, Financial and Tax Issues in DivorceIICLE2010
Awarded AdmissionUnited States District Court2010
Business Valuation, Financial, and Tax Issues Affecting DivorceIICLE2008
Trial Skills 450: Advanced EvidenceAmerican Academy of Matrimonial Lawyers2008
Institute for Training Family Law AssociatesAmerican Academy of Matrimonial Lawyers2006
Nation Product Liability Moot Court OctofinalistAugust A. Rendigs, Jr. National Moot Court Competition2001
Work experience
TitleCompany nameDuration
PartnerLaw Firm of Martin Osinski, LLC2010 - Present
Senior AttorneyLaw Firm Of Wendy R. Morgan2008 - 2010
AttorneyFamily Law Firm2004 - 2008
AttorneyA personal Injury Firm2002 - 2004
Litigation ClerkJenner & Block1998 - 1999
Association namePosition nameDuration
Chicago Board of RealtorsMember2013 - Present
Rolling Meadows CourthouseVolunteer Legal Help Desk2010 - 2011
United States District Court for the Northern District of IllinoisAttorney Member2010 - Present
Chicago Volunteer Legal ServicesVolunteer Attorney2003 - 2004
Illinois State Bar AssociationMember2002 - Present
Chicago Bar AssociationMember2002 - Present
Legal cases
Case nameOutcome
A. K. v. M. L.Successfully defeated Motion to Dismiss and obtained contribution from M. L.
See all legal cases 
Publication nameTitleDate
Apex Continuing Legal EducationFamily Law 1012010
Chicago CommuterUnlawful Visitation Interference: Criminal and Civil Penalties2007
School nameMajorDegreeGraduated
John Marshall Law School, ChicagoLawJD - Juris Doctor2002
University of Illinois, Urbana-ChampaignPolitical ScienceBA - Bachelor of Arts1997
University of Chicago Laboratory SchoolGeneral EducationN/A1993
Speaking engagements
Conference nameTitleDate
Family Law Panel at Chicago-Kent College of LawFamily Law Panel2014
Apex Continuing Legal EducationFamily Law2010
National Radio InterviewFamily Law and Divorce2008
Chicago Polish Radio InterviewFamily and Divorce Law2008
Free Family Law SeminarIn and Outs of Divorce and Family Law2007