Thompson, Bissett & Castonia, LLP - Oshkosh, WI office in Oshkosh, Wisconsin
Thompson, Bissett & Castonia, LLP - Oshkosh, WI

Thompson, Bissett & Castonia, LLP - Oshkosh, WI

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600 S Main St STE 202, Suite 202, Oshkosh, Wisconsin, United States
35 Years of Practicing, since 1991
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+1 920-231-5050
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Thompson, Bissett & Castonia, LLP (known as Thompson & Castonia, LLP and Oshkosh Women Lawyers) is an established family law, criminal defense, and juvenile advocacy practice in Oshkosh, Wisconsin. Serving Winnebago County and the Fox Cities since 1991, partners Jennifer F. Thompson and Rebecca C. Castonia combine aggressive courtroom litigation with compassionate client care.

Zealous Family Law and Criminal Defense Advocacy in Oshkosh

Legal challenges involving family transitions, child welfare, or the threat of criminal prosecution create tremendous emotional and financial strain. Established in 1991, Thompson, Bissett & Castonia, LLP has spent decades providing steadfast legal advocacy for individuals and families across Oshkosh, Neenah, Menasha, Appleton, and the surrounding Fox Valley communities. Led by senior partners Jennifer F. Thompson and Rebecca C. Castonia, this prominent women-led firm is dedicated to delivering outcome-driven representation both in and out of the courtroom.

Whether clients need to hire an attorney for a contentious divorce or wish to consult an experienced lawyer regarding criminal misdemeanor or felony charges, the firm provides clear guidance and dedicated support. Attorneys Thompson and Castonia also serve as court-appointed Guardian ad Litem representatives, offering unparalleled insight into judicial procedures and the standards that safeguard children and vulnerable adults.

Comprehensive Divorce and Family Law Representation

Navigating the dissolution of a marriage or resolving custody disputes requires an attorney who balances empathy with uncompromising courtroom strength. Thompson, Bissett & Castonia, LLP handles all aspects of domestic relations under Wisconsin law:

  • Divorce and Legal Separation: Assisting spouses with complex marital property division, debt allocation, maintenance (alimony) determinations, and post-judgment modifications.
  • Child Custody and Physical Placement: Developing equitable parenting plans that prioritize the best interests of the children while safeguarding parental rights.
  • Child Support and Paternity: Establishing biological parentage, enforcing statutory child support guidelines, and handling administrative adjustments.
  • Adoption and Guardianship: Assisting families with stepparent adoptions, termination of parental rights, and protective guardianships for minors and incapacitated adults.
  • Domestic Violence and Restraining Orders: Providing assertive advocacy for individuals seeking or defending against temporary restraining orders and domestic abuse injunctions.

Strategic Criminal Defense and Traffic Violation Advocacy

When your liberty and future are on the line, having a seasoned trial attorney makes a critical difference. Thompson, Bissett & Castonia, LLP provides rigorous defense against Wisconsin state criminal charges and traffic violations. Partner Rebecca Castonia and the legal defense team aggressively challenge traffic stops, examine police protocols, and build tailored defense strategies for:

  • Operating while intoxicated (OWI / DUI) first offenses and repeat felony drunk driving charges.
  • Misdemeanor and felony drug offenses, property crimes, theft, and disorderly conduct citations.
  • Juvenile delinquency matters and formal court hearings.
  • Driver's license suspensions, revocations, and serious moving traffic violations.

Estate Planning and Advance Directives

In addition to courtroom litigation, the firm assists Fox Valley families in protecting their hard-earned assets and defining their final wishes. The practice drafts foundational estate planning documents, including last wills and testaments, durable powers of attorney for finances, and healthcare powers of attorney, providing clients with enduring peace of mind.

Why Clients Trust Thompson, Bissett & Castonia, LLP

When you need an attorney urgently during a family crisis or following an arrest, Thompson, Bissett & Castonia, LLP responds with prompt, personalized attention. With an established track record spanning over three decades, the attorneys combine thorough case preparation with clear, honest counsel. Contact the Oshkosh office today to schedule a consultation and secure experienced legal representation.


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Location & Access

Primary Address

Located in the historic Sawdust District of Oshkosh, just south of the Fox River and close to Riverside Park.

Building Location

The legal office is located on the second floor of the historic Brooklyn Office Building (also known as the Brooklyn Office Condominium), a charming three-story brick commercial building constructed in 1915. The property features spectacular views of the Fox River.

Parking Details

A dedicated surface parking lot in the rear of the building is available for all tenants, clients, and visitors, providing free parking.

Accessibility / Suite Access

Enter through the building's main entrance. Take the elevator or stairs to the second floor, and you will find the entrance to the legal office in Suite 202.

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