Dayrel S. Sewell

“We Have a One-On-One, Personal Approach That Isn’t Typical Of Many Attorney-Client Relationships.”

Dayrel S. Sewell, Esq. – Top Litigation Attorney in New York| Award-Winning NYC Intellectual Property Lawyer

Attorney Dayrel S. Sewell, Esq. stands out as one of the best Litigation Attorneys in New York City, earning national and local recognition for excellence. Featured on CNN as a top legal authority and awarded Litigation Lawyer of the Year in the USA, Mr. Sewell continues to be a leading figure in NYC litigation and intellectual property law.

 

His achievements include:

• 8-time New York Super Lawyers honoree

• 10-time National Black Lawyers – Top 100 recipient

• Rated “Superb” by Avvo and recognized as a Top Litigation Attorney in NYC

 

This level of acclaim makes Mr. Sewell a trusted choice for clients seeking superior representation in New York litigation, intellectual property disputes, and patent and trademark matters.

 

Comprehensive Litigation and Transactional Experience in New York

Attorney Sewell brings extensive experience in state and federal litigation, as well as high-level transactional matters. He has represented clients across Brooklyn, Manhattan,  and wider New York State.

 

He is highly skilled in matters related to the United States Patent & Trademark Office (USPTO) and the United States Copyright Office.

 

Mr. Sewell represents:

 

• Patent and trademark owners

• Copyright holders

• Food & drug companies

• Business owners

• Real estate investors

• Startups and entrepreneurs

• Corporate and private clients

 

His past work at a Top 100 U.S. law firm focused heavily on litigation and intellectual property law, making him a top choice for clients seeking strong legal protection in NYC and beyond.

 

Proven Track Record in Justice Advocacy

 

As a proud alumnus of the Innocence Project at the Benjamin N. Cardozo School of Law, Attorney Sewell drafted legal motions and briefs to reopen wrongful convictions using DNA evidence. His contributions directly led to the exoneration of a client, further demonstrating his commitment to justice and exceptional legal skills.

 

Deep Expertise in Patent Litigation & Regulatory Law

 

During his legal fellowship at Bristol-Myers Squibb Company, Mr. Sewell gained advanced experience in:

 

• Patent litigation

• Patent prosecution

• Federal Circuit appeals

• Pharmaceutical regulatory matters

 

His work in compliance, corporate agreements, and clinical trial documentation positions him as a highly knowledgeable NYC patent attorney and regulatory law advisor.

 

Real Estate Litigation Attorney Serving NYC, Brooklyn & Manhattan

 

With New York facing a growing real estate crisis, Attorney Sewell offers strategic counsel to property owners, buyers, sellers, and investors. He provides strong litigation support for clients across Brooklyn, Manhattan, Queens, and New York City in matters involving property disputes, contracts, landlord–tenant issues, and more.

 

Academic Excellence & Research Background

 

Mr. Sewell earned his Master of Public Health (M.P.H.) from Columbia University, where he directed medical research studies. He also holds a B.A. from The Johns Hopkins University, majoring in Natural Sciences and Public Health. His scientific background further strengthens his analytical approach to complex legal issues.

 

Despite a demanding professional life, Attorney Sewell dedicates time to pro bono legal services, helping underserved communities with legal challenges. He is also proficient in Spanish, enabling him to assist a broader range of clients throughout New York City.

 

Why NYC Clients Choose Dayrel S. Sewell, Esq.

 

Clients select Mr. Sewell because he is:

 

• A Top Litigation Attorney in NYC

• An experienced Intellectual Property Lawyer in New York

• A trusted Patent & Trademark Attorney in Manhattan

• An award-winning professional recognized nationally

• Committed to justice, precision, and client-focused representation

 

Some examples of Attorney Sewell’s work include:

 

• High-stakes litigation, settlements, and/or verdicts involving businesses, class actions, municipal liability, contracts, civil rights, real estate, patents, securities, foreclosures, trademarks, copyrights, LLCs, and torts in excess of 10 million dollars
• Negotiating/authoring business contracts
• real estate closings, brokerage services, and transactions (i.e., conveyances, leases, title searches, deeds, assignments, etc.)
• drafting and registering patents, trademarks, and copyrights; issuing patent and trademark opinions
• counseling clients regarding food & drug product registration, compliance, and other regulatory matters
• advising startup companies and creating their business entity structure

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Bar admissions

• United States Supreme Court
• New York
• District of Columbia
• United States Patent Bar
• United States Court of Appeals for the Second Circuit
• United States Court of Appeals for the Federal Circuit
• United States District Court for the Southern District of New York
• United States District Court for the Eastern District of New York

Degrees

• J.D., Benjamin N. Cardozo School of Law
• M.P.H., Columbia University
• B.A., The Johns Hopkins University

Awards & Distinctions

• 40-for-40 Alumni Spotlight In Excellence, Oliver Scholars
• Best Mentor, Finalist, ALM New York Legal Awards (2025)
• American Trial Academy – Inductee (2020)
• Litigation – Lawyer of the Year – USA, Finance Monthly Law Awards (2017)
• Super Lawyers NYC Metro (2015-2017; 2021-2025)
• The National Black Lawyers – Top 100 (2016-2025)
• Best Litigation Attorneys in Brooklyn, Expertise (2016-2025)
• Hearing Officer, NYS Gaming Commission
• Lead Arbitrator, Richmond County Fee Arbitration Program
• Notes Editor, Cardozo Journal of Law & Gender
• Alumnus, The Innocence Project, Benjamin N. Cardozo School of Law
• Marquis Who’s Who Lifetime Achievement Award (2017)
• Marquis Who’s Who in American Law (2014-2016)
• NIEHS Community & Preventive Medicine Fellow, Mount Sinai School of Medicine
• Recipient, Phoenix Fellowship, Columbia University
• Alumnus, Council on Legal Education Opportunity
• Winner, Black Bar Association of Bronx County Writing Competition
• Federal Acquisition Regulations Certificate
• HIPAA Research Compliance Certificate

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Publications

• Dayrel S. Sewell, Attorney-Client Privilege: Protections and Pitfalls, The Brooklyn Barrister, Summer 2023, at 1.
• Dayrel S. Sewell & Ariel Friedman, The Increasing Intellectual Property Value of the .COM to Businesses, Colum. Sci. & Tech L. Rev. (Nov. 10, 2021), https://journals.library.columbia.edu/index.php/stlr/blog/view/404.
• Dayrel S. Sewell, Graffiti: Legal or Illegal?, The Brooklyn Barrister, Fall 2020, at 12.
• Dayrel S. Sewell, Ruth Buchbinder, Demonstrative Evidence: Friend or Foe?, The Brooklyn Barrister, Spring 2017, at 1.
• Dayrel S. Sewell, Lance Willoughby, Landlords and Loft Space, The Richmond County Bar Association Journal, Spring 2017, at 24.
• Dayrel S. Sewell, Andrew Janof, Shrouded in Secrecy: LLCs and High-End Real Estate, The Brooklyn Barrister, September 2016, at 1.
• Dayrel S. Sewell, Amulya Appalaraju, The Duality of the U.S. Supreme Court’s Janus Decision, American Bar Association, Securities Litigation, 2015 Fall Newsletter.
• Dayrel S. Sewell, Andrew Fine, The “Redskins” Trademark: Turn-over on Downs, IPFrontline, October 2015.
• Dayrel S. Sewell, Ivan Ng, Pharrell Williams and Robin Thicke told they “Got To Give It Up”, IPFrontline, May 2015.
• Dayrel S. Sewell, Ivan Ng, A ‘Generic’ Victory for Specific Fact-Findings, Intellectual Property Today, March 2015, at 34.
• Dayrel S. Sewell, Ivan Ng, A ‘Generic’ Victory for Specific Fact-Findings, IPFrontline, February 2015.
• Dayrel S. Sewell, Myriad Back in Court on Patent Subject Matter Eligibility, The Brooklyn Barrister, January/February 2015, at 9.
• Dayrel S. Sewell, The Ignominious Patent Troll, The Brooklyn Barrister, November 2013, at 5.
• Dayrel S. Sewell, The Ignominious Patent Troll, Intellectual Property Today, November 2013, at 12.
• Dayrel S. Sewell, Unanimous U.S. Supreme Court and Angelina Jolie: BRCA1 & BRCA2 Patentability, Intellectual Property Today, July 2013, at 24.
• Dayrel S. Sewell, Marc S. Ullman, The Regulation of Advertising for Dietary Supplements in the United States, KENKO SANGYO RYUTSU SHIMBUN (Health Trade Newspaper), April 8, 2007, at Issue 661.
• Tam T. Nguyen, Dayrel S. Sewell(Top Litigation Attorney) and Adrian S. Dobs. Oral Methyltestosterone Given to Post-menopausal Women Decreases Adipose Tissue and Increases Lean Muscle Mass with No Change in Muscle Strength. ENDO 2000 Abstracts. Category: Clinical Science: Aging. Medicine, Johns Hopkins University (2000).

Speaking Engagements

• Dayrel S. Sewell, Legal Panelist, Election Follow Up – What is with all the chaos?, November 2020.
• Dayrel S. Sewell, Brooklyn Bar Association Continuing Legal Education Speaker, Intellectual Property Fundamentals: What Every Attorney Needs to Know, May 2014.
• Dayrel S. Sewell, Legal Analyst (en español ), CNN “Realidades En Contexto”: Nueva Jersey Agentes Inmobiliarios haber supuestamente Relaciones repetidas Dentro de una casa en venta, March 2014.
• Dayrel S. Sewell, Panelist, Managing Career Changes in a Changing Global Market, Union League Club, November 2013.
• Dayrel S. Sewell, Presenter, Professional Development, Bristol-Myers Squibb Legal Department Conference, June 2009.

Other Licenses

• New York State Real Estate Broker
• New York State Notary Public

Organizations

• New York State Academy of Trial Lawyers
• Columbia University Alumni Association
• The Johns Hopkins University Law Affinity Committee

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