Atty. Kat E. Mateo
Katherine Mateo is a skilled litigator with extensive experience in resolving complex, high-stakes commercial disputes for prominent companies and individuals. For nearly a decade, Kat has helped clients navigate claims and investigations.
Commercial Litigation & More Attorney · Serving New York, NY
Profile Summary
About Kat E. Mateo at a Glance
Kat E. Mateo is a business and litigation attorney based in New York, New York, practicing at Olshan Frome Wolosky Llp. Educated at Stanford University (J.D., 2014). Recognitions include Best Lawyers in America — Commercial Litigation (2026), Best Lawyers in America — Litigation - Securities (2026), and Best Lawyers in America — Awards: (2026). Serves clients in New York, NY and the surrounding metropolitan area.
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About Kat E. Mateo
- Katherine Mateo is a skilled litigator with extensive experience in resolving complex, high-stakes commercial disputes for prominent companies and individuals
- For nearly a decade, Kat has helped clients navigate claims and investigations
- From single-plaintiff cases to class actions, she has achieved favorable results at trial, on appeal, through arbitration, mediation and negotiated settlement
- Kat has handled a range of commercial disputes including those involving intellectual property, securities, fraud, breach of contract, white-collar defense, transactional matters, bankruptcy, antitrust, and toxic tort
- She has prevailed in cases related to residential mortgage-backed securities and Foreign Corrupt Practices Act (FCPA) investigations, has steered clients through internal investigations, and successfully defended both individual and corporate clients in major cross-border criminal investigations
- Multinational companies, financial institutions, executives and directors, and high-net-worth individuals rely on Kat’s broad experience throughout all phases of litigation, from crafting pretrial strategies and settlements to trials, appeals, and alternative dispute resolution mechanisms
- Working closely with her clients, she identifies pragmatic, cost-effective strategies that manage risk and align with each client’s business objectives and needs
- With her clients’ goals front and center, she focuses on the critical issues at stake, positioning clients for successful outcomes at every case stage
- Clients praise Kat for her calm manner in stressful situations and frequent communication, informing them of all case and matter issues and developments
- Known for her enthusiasm in practice and a long-standing commitment to diversity and inclusion, Kat previously served as the head of an affinity group for attorneys and staff members of color and is currently a member of Olshan’s Diversity & Inclusion Committee
- Before joining Olshan, Kat was a litigation associate at Morrison & Foerster
- She is fluent in Spanish
Practice Areas Explained
Kat E. Mateo's Areas of Legal Practice
Each practice area below reflects the types of cases Kat E. Mateo handles, with a practical overview of what that area of law involves and how it may apply to your situation in New York.
Business & Corporate Law in New York
Business attorneys advise founders and growing companies on entity formation, contracts, financing, M&A, and dispute resolution.
Kat E. Mateo is one of 497,491 business attorneys indexed nationally. Browse business attorneys in New York →
Civil Litigation in New York
Civil litigation attorneys for breach of contract, business disputes, civil rights, and class action lawsuits.
Kat E. Mateo is one of 450,751 litigation attorneys indexed nationally. Browse litigation attorneys in New York →
Jurisdictional Context
Why Local Counsel Matters in New York
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 New York 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.
New York Courts and Legal Process
Choosing a New York-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.
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Professional Profile
Why Clients in New York Choose Kat E. Mateo
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 Kat E. Mateo's practice in the field of business and litigation.
Broad Practice Area Coverage
Covering business and litigation, Kat E. Mateo can address the full spectrum of a client's legal needs without requiring referrals to separate specialists for each issue.
Local Presence in New York
A New York-based practice means Kat E. Mateo 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 Kat E. Mateo Handles in New York
Below is a representative sample of the types of matters Kat E. Mateo 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 Kat E. Mateo directly to discuss the specifics of your situation.
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Kat E. Mateo's Practice Areas & Specializations
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