About Bonnie Lynn Chmil

Representing private clients in litigation requires an appreciation for the dynamics of these often-sensitive disputes. Whether Bonnie is advising high-net-worth individuals, families or fiduciary trust companies, she balances her extensive experience in commercial litigation with a sensitivity to the needs and expectations of private clients and fiduciaries.

Finding efficient solutions for sensitive litigation

Bonnie knows that most parties want a quick and practical resolution to private client disputes. She therefore focuses on her clients' desired endgame from day one, looking for the most efficient way of getting there. It's a no-nonsense approach that often results in favorable resolutions. For Bonnie and her clients, those can come either through negotiated settlements or effective litigation tactics.

Bonnie demonstrated her talent for efficiency when she attended college and law school at night while working in the financial services industry. That experience provided valuable background for her present work, and it has helped her to achieve success for her clients' results. Among other wins, Bonnie has earned the dismissal of a $40 million fraud claim against an insurer, defeated a $100 million claim against an estate and secured a $150 million settlement for a client against the estate of her ex-husband.

On top of her industry experience, Bonnie brings detailed knowledge of commercial litigation to all of her work. She regularly represents clients in disputes involving real estate, commercial contracts and business torts.

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"Bonnie's attention to detail is incredible. She is also very strategic and has always been very good in litigation."

Chambers High Net Worth 2025
(New York, Private Wealth Disputes) survey response

Practice Focus

  • Private client litigation
  • Resolution of disputes outside litigation
  • Representation of trusts and fiduciaries in estate-related disputes
  • Commercial litigation

Representative Experience

  • Defended a global trade credit insurance company against tort claims in which the plaintiff bank sought in excess of $42 million in damages. Dismissal was affirmed by the Appellate Division, First Department.
  • Defend a national banking association in its capacity as corporate trustee against claims brought by beneficiaries pertaining to a property sale. Plaintiffs seek in excess of $100 million in damages.
  • Represented executors of a $279 million estate against claims brought by family members seeking in excess of $85 million.
  • Represented global financial institution in various litigations arising out of a $400 million Ponzi scheme.
  • Represented minority shareholder in breach of fiduciary and related claims against the officers, directors and majority shareholder of a privately held company.
  • Represent beneficiaries in multi-generational family trust disputes.
  • Represented international trust company in a dispute involving a Manhattan condominium.
  • Achieved favorable settlement of a beneficiary’s claims against a multibillion-dollar estate.
  • Represented lenders in various commercial project disputes, including a luxury condominium development project in Manhattan; a mixed-used project anchored by a luxury hotel in Paradise Valley, Arizona; and various commercial properties in New York, New Jersey and Texas.
  • Represent lenders in foreclosures on commercial mortgages in New York.
  • Obtained a $31 million judgment against a guarantor of a commercial mortgage.
  • Obtained dismissal of claims against a private school seeking in excess of $2 million in damages, which dismissal was affirmed by the Appellate Division, which also denied the plaintiff’s motion to reargue and for leave to appeal to the Court of Appeals.
  • Obtained dismissal of fraudulent inducement and promissory estoppel claims against a private school brought by parents of several former students concerning changes to staff and curriculum during the COVID-19 pandemic.

News

Publications

Presentations and Events

Practices
Industries
Education
  • Fordham University School of Law, JD
  • Fordham University, BA, summa cum laude
Bar Admissions
  • New York
Court Admissions
  • US District Court, Eastern District of New York
  • US District Court, Southern District of New York
Recognitions
Recognized or listed in the following:
  • ALM/Law.com
  • Chambers High Net Worth
    New York: Private Wealth Law, 2020
    New York: Private Wealth Disputes, 2020-2025
  • Citywealth
    Diversity/Gender Positive Role Model of the Year, 2022
    Magic Circle Awards: Woman of the Year (Gold), 2023
    Top 100 International Private Client Litigation Lawyers, 2022–2023
    Top 100 Trust Litigators and Polymaths, 2020, 2025
  • Citywealth Powerwomen Awards
    Top 100 International Powerwomen, 2024-2025
    Top 10 Powerwomen Trust Litigators, 2020
  • Katten Muchin Rosenman LLP Pro Bono Service Award
    2013
  • Lexology Index
    Private Client, 2024
  • Private Client Global Elite Directory
    Rising Leaders, 2022–2023
  • Super Lawyers
    New York, 2024
  • Super Lawyers Rising Stars
    New York, 2014–2015
  • Thomson Reuters
    Stand-out Lawyer, 2024–2025
Award Methodologies