Atty. William Daniel Marsillo
William Daniel Marsillo is a lawyer practicing commercial, litigation. William received a B.S.E. degree from Stevens Institute of Technology in 1994, and has been licensed for 28 years.
Commercial & More Attorney · Serving Armonk, NY · 28+ Years Experience
Profile Summary
About William Daniel Marsillo at a Glance
William Daniel Marsillo is a Partner based in Armonk, New York, practicing at Boies, Schiller & Flexner LLP. They have 28+ years of legal experience, licensed to practice since 1998. Their practice focuses on business and litigation. Admitted to practice in New York (1998). Educated at Harvard Law School (J.D., 1997) and Stevens Institute of Technology (B.S.E. Materials, 1994). Serves clients in Armonk, NY and the surrounding metropolitan area.
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About William Daniel Marsillo
- William Daniel Marsillo is a lawyer practicing commercial, litigation
- William received a B.S.E. degree from Stevens Institute of Technology in 1994, and has been licensed for 28 years
- William practices at Boies, Schiller & Flexner LLP in Armonk, NY
Practice Areas Explained
William Daniel Marsillo's Areas of Legal Practice
Each practice area below reflects the types of cases William Daniel Marsillo handles, with a practical overview of what that area of law involves and how it may apply to your situation in Armonk.
Business & Corporate Law in Armonk
Business attorneys advise founders and growing companies on entity formation, contracts, financing, M&A, and dispute resolution.
William Daniel Marsillo is one of 497,491 business attorneys indexed nationally. Browse business attorneys in New York →
Civil Litigation in Armonk
Civil litigation attorneys for breach of contract, business disputes, civil rights, and class action lawsuits.
William Daniel Marsillo is one of 450,750 litigation attorneys indexed nationally. Browse litigation attorneys in New York →
Jurisdictional Context
Why Local Counsel Matters in Armonk
Practicing law in New York. Legal matters in New York are governed by state-specific rules of civil and criminal procedure, statutes of limitations, and substantive law. Cases originating in Armonk are typically filed in the local municipal court or the appropriate New York state district court, depending on subject matter and amount in controversy. An attorney licensed in New York brings working knowledge of local procedural deadlines, judicial practices in this venue, and the substantive law that applies to cases brought here. Out-of-state attorneys generally cannot represent clients in New York courts without local counsel or pro hac vice admission.
Armonk Courts and Legal Process
Choosing a Armonk-based attorney means your counsel already knows the local docketing timelines, preferred filing formats, and how individual judges typically rule on procedural motions — details that only come from practicing in this jurisdiction day after day. That local familiarity can translate to better strategy, faster filings, and fewer costly surprises.
Looking for additional New York attorneys? Browse all attorneys in Armonk or all attorneys in New York.
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Professional Profile
Why Clients in Armonk Choose William Daniel Marsillo
Selecting an attorney is one of the most consequential decisions you can make when a legal matter arises. Below are the core qualities that distinguish William Daniel Marsillo's practice in the field of business and litigation.
Decade-Tested Legal Experience
William Daniel Marsillo brings 28+ years of hands-on legal practice — enough to have navigated the recurring fact patterns, procedural traps, and negotiation dynamics that shape case outcomes.
Broad Practice Area Coverage
Covering business and litigation, William Daniel Marsillo can address the full spectrum of a client's legal needs without requiring referrals to separate specialists for each issue.
Local Presence in Armonk
A Armonk-based practice means William Daniel Marsillo attends hearings in the same courthouses, knows the local clerks, and understands the unwritten scheduling norms that affect every case filed here.
Case Types
Common Legal Issues William Daniel Marsillo Handles in Armonk
Below is a representative sample of the types of matters William Daniel Marsillo has experience with under New York law. If your situation involves one of these case categories, this attorney may be well positioned to help you understand your options.
This list is illustrative, not exhaustive. Contact William Daniel Marsillo directly to discuss the specifics of your situation.
Search Reference
How People Find William Daniel Marsillo Online
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William Daniel Marsillo's Practice Areas & Specializations
Education & Law School Background
Bar Admissions & Licensed Jurisdictions
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