
Sienna Thorne
Divorce & Family Law Attorney
Sienna Thorne is a divorce and family law attorney in Chicago, Illinois. Admitted to the Illinois bar in 2009, she has spent her career on separation, custody, and support matters, and takes no cases outside family law.
Sienna Thorne has practiced divorce and family law in Chicago since her admission to the Illinois bar in 2009. Her work spans contested and uncontested dissolution, allocation of parental responsibilities and parenting time, spousal maintenance, division of marital property, and prenuptial agreements — the whole of family law, and nothing outside it.
She approaches every matter the same way: understand the family before advising on the law. That means listening first, mapping the outcomes a court could realistically reach, and being candid about which of them are worth the cost of pursuing. Clients hear the weak parts of their case from her before they hear them from anyone else.
Where a matter can be resolved without litigation, she pursues it that way. She sits on the Cook County Circuit Court approved family mediation panel, and a substantial share of her practice is negotiated settlement and mediated parenting agreements — which are faster, cheaper, and easier for children to live through than a contested trial.
Where it cannot be resolved that way, she litigates. Emergency motions, orders of protection, and contested custody hearings are part of the practice, handled with the same attention to the client's wellbeing that shaped the strategy in the first place.
She practices in Illinois only, primarily in Cook, DuPage, and Lake County courts. Family law turns heavily on the state it is heard in, and she will say so plainly rather than guess at another state's rules.
Credentials & Admissions
- J.D., Northwestern University Pritzker School of Law, 2009
- Admitted to the Illinois bar, 2009 — ARDC No. 9900142
- Certified mediator, Cook County Circuit Court approved family mediation panel
Admitted to practice in Illinois since 2009 (ARDC No. 9900142). Not licensed in any other state.
Sienna Thorne is licensed to practice only in Illinois. Information provided on this site is general in nature and is not specific to your jurisdiction.
Practice Areas
Divorce
Contested and uncontested dissolution, from the initial petition through final judgment — including the financial disclosure that decides most of what follows.
Child Custody
Allocation of parental responsibilities, parenting time schedules, modification as circumstances change, and relocation within or outside Illinois.
Spousal Support
Maintenance under the Illinois guidelines, deviations from them, and modification or termination when income or circumstances change.
Property Division
Identifying, valuing, and dividing marital and non-marital property — homes, retirement accounts, business interests, and the debts that come with them.
Prenuptial Agreements
Drafting and reviewing agreements before marriage, with the disclosure and independent-counsel steps that keep them enforceable later.
Mediation
Guided negotiation toward a settlement both parents can live with, as a court-approved mediator or as your advocate in someone else's mediation.
Ready to Take the Next Step?
Schedule your strategy session and let's discuss your path forward.