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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

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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

30 total 

Are you an attorney? Endorse this lawyer

  • Kevin P. McCarty

    I endorse this lawyer.


    Kevin McCarty Divorce and separation Attorney
    Relationship: Worked together on matter

  • 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

Contact info

Law Firm of Martin Osinski, LLC

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


ILActive And Authorized To Practice Law200205/11/2016
We have not found any instances of professional misconduct for this lawyer.
Avvo contributions
Legal answers
Award nameGrantorDate granted
Client's Choice AwardAvvo2016
10 Best Family Law Attorneys in ILAmerican Institute of Family Law Attorneys2016
Top ContributorAvvo2013
Excellent RatingAvvo2013
Awarded AdmissionUnited States District Court2010
Institute for Training Family Law AssociatesAmerican Academy of Matrimonial Lawyers2006
Nation Product Liability Moot Court OctofinalistUniversity of Cincinnati Law School2002
Work experience
TitleCompany nameDuration
OwnerLaw Firm of Martin Osinski, LLC2010 - Present
Volunteer AttorneyCook County Circuit Court2010 - 2011
Volunteer AttorneyChicago Volunteer Legal Services2010 - 2011
Senior AttorneyLaw Firm Of Wendy R. Morgan2008 - 2010
AttorneyFamily Law Firm2004 - 2008
AttorneyChicago Volunteer Legal Services2003 - 2004
AttorneyManchik & Romaker, P.C.2002 - 2004
Litigation ClerkJenner & Block1998 - 1999
Association namePosition nameDuration
Northwest Suburban Bar Association, Young Lawyers CouncilMember2016 - Present
Northwest Suburban Bar Association, Matrimonial Law CouncilMember2016 - Present
Chicago Bar Association, Domestic Relations CommitteeMember2016 - Present
Chicago Board of RealtorsMember2013 - Present
United States District Court for the Northern District of IllinoisAttorney Member2010 - Present
Illinois State Bar AssociationMember2002 - Present
Chicago Bar AssociationMember2002 - Present
Illinois Trial Lawyers AssociationMember2002 - 2004
Legal cases
Case nameOutcome
A. K. v. M. L.Successfully defeated Motion to Dismiss and obtained contribution from M. L.
D. R. v. P. R.Obtained a 50/50 split custody to my client; client not required to refinance and remove ex-wife's name from the mortgage until the youngest child graduates.
R. M. v. B. A.Obtained temporary custody of minor children from my client; mother ordered to random drug testing
See all legal cases 
Publication nameTitleDate
Apex Continuing Legal EducationBreaking Up Is Easy To Do; Splitting Property Is Hard2010
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
Illinois Institute for Continuing Legal EducationBusiness Valuation, Financial and Tax Issues in Divorce2010
Apex Continuing Legal EducationBreaking Up Is Easy To Do; Splitting Property Is Hard2010
Apex Continuing Legal EducationFamily Law2010
National Radio InterviewFamily Law and Divorce2008
Illinois Institute for Continuing Legal EducationBusiness Valuation, Financial and Tax Issues in Divorce2008
Illinois Institute for Continuing Legal EducationTrial Skills 450: Advanced Evidence2008
Free Family Law SeminarDivorce and Family Law2008
Chicago Polish Radio InterviewFamily and Divorce Law2008
Free Family Law SeminarIn and Outs of Divorce and Family Law2007