
Introduction
Marissa Muscarella is an experienced disputes resolution attorney and trusted advisor to businesses within Nixon Peabody’s Complex Commercial Disputes practice group. She represents public and private companies in a wide variety of state and federal litigation matters and also provides strategic legal and business counsel to clients on responding to various subpoenas and government inquiries.
My focus
Complex Dispute Resolution
A significant part of my practice is representing businesses, including their shareholders, owners, and investors, across a diverse range of industries, such as finance, healthcare, and real estate, in complex business litigation within state and federal courts. I manage cases from inception to resolution involving allegations such as fraud, breaches of contract and fiduciary duties, negligence, and restrictive covenant violations. I also counsel clients on mitigation of risk and resolving and deescalating business disputes at a pre-litigation stage.
Additionally, I advise board members, shareholders, and investors on corporate governance issues and fiduciary duties and guide LLC members or partners through successful exits. I also deliver analysis of complex commercial agreements such as stock purchase agreements or licensing agreements to help clients manage risk and understand contractual rights and obligations.
Responding to non-party and regulatory subpoenas
Much of my work has involved counseling clients through high-stakes non-party, government, and regulatory subpoenas. I develop strategic responses and manage document production and privilege issues. I prioritize balancing a client’s compliance obligations with risk management and business considerations. I also work with clients to proactively address compliance and regulatory issues impacting their specific industries.
Investigations
I have helped lead internal investigations for clients, including in the healthcare and insurance industries, to advise on and identify employee misconduct, fraud, or regulatory violations. I lead witness interviews, evaluate facts, and present findings and recommendations for paths forward.
Labor & Employment Litigation
My background also includes defending companies in a variety of labor and employment cases filed in both state and federal courts, and with the New York State Division of Human Rights.
Looking ahead
I am thinking about how companies can use AI in various aspects of litigation, such as eDiscovery and legal research, to responsibly achieve efficiency and reduce risk without compromising defensibility in light of evolving court expectations.
In the news
- Law360
Supplement co. inks $1.7M deal ending toxic drink claims
This article, covering the preliminary approval for a settlement between consumers and the makers and sellers of recalled dietary supplement All Day Energy Greens, mentions NP for representing Independent Vital Life LLC, one of the defendants. The NP team includes Long Island Complex Commercial Disputes partner Joseph Ortego, counsel Santo Borruso, and associates Marissa Muscarella and Matthew Forzano.Jan 12, 2022
Admitted to practice
New York
U.S. District Court, Eastern District of New York
U.S. District Court, Southern District of New York
Education
St. John's University School of Law, J.D., cum laude
Boston College, B.A.
Recognition
- Received a 2025 Best Lawyers: “Ones to Watch” recognition for Commercial Litigation, Construction Law, Litigation—Real Estate and Real Estate Law; listed in Best Lawyers: Ones to Watch since 2021.
- Recommended in The Legal 500 United States 2024 editorial for practice focus—Dispute resolution - Product liability, mass tort and class action: toxic tort - defense.
Insights And Happenings
View AllProfessionals in the Practice Area
View AllJohn Ruskusky
Partner / Practice Group Leader, Complex Disputes- Chicago
- Office:+1 312.977.4460Mobile:+1 708.606.8720
- jtruskusky@nixonpeabody.com

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Daniel J. Hurteau
Office Managing Partner / Deputy Practice Group Leader, Complex Disputes- New York City
- Office:+1 518.427.2652
- dhurteau@nixonpeabody.com

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Joseph J. Ortego
Partner / Chair, NP Trial / Leader, Aviation- New York City
- Office:+1 212.940.3045
- jortego@nixonpeabody.com

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Carolyn G. Nussbaum
Senior Counsel- Rochester
- Office:+1 585.263.1558Mobile:+1 585.766.1480
- cnussbaum@nixonpeabody.com

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Christopher M. Mason
Partner / Deputy Leader, Class Actions & Aggregate Litigation / Leader, Arbitration Team- New York City
- Office:+1 212.940.3017
- cmason@nixonpeabody.com

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