Leason Ellis

What Leason Ellis does

Leason Ellis LLP is a White Plains, New York-based intellectual property law firm founded in 2008 by David Leason and Edward Ellis, both former partners at Darby & Darby. The firm operates as a limited liability partnership and offers a full-service IP practice built around four core areas: patent prosecution and portfolio management, trademark clearance and enforcement, copyright registration and counseling, and IP litigation across federal courts and the USPTO. A fifth practice area, technology transactions, supports IP licensing and technology transfer work, particularly for life sciences and biotech clients.

The firm's differentiator is its bench of attorneys with advanced technical degrees (MD, PhD, MSEE, MSCE, EE, ME, CE) spanning biochemistry, biology, chemistry, computer science, engineering, genetics, immunology, life sciences, materials science, mathematics, microbiology, molecular biology, pharmacology, and physics. This technical depth enables handling of complex matters in pharmaceuticals, biotechnology, medical devices, electronics, and software. Consecutive-year recognition in IAM Patent 1000 (13 lawyers in 2026), World IP Review Leaders (5 partners in 2026), and Best Lawyers' Best Law Firms (Copyright and Trademark 2026) reinforce its reputation as one of the largest IP firms outside Manhattan in New York State.

The firm generates revenue through professional services billing on hourly rates and retainer agreements. Go-to-market is sales-led via direct attorney-client relationships, professional referrals, industry conference participation (INTA, BIO International Convention), and thought leadership through The Newtonian quarterly newsletter and publications in World Trademark Review, IP Owners Quarterly, and INTA Bulletin. Customer segments are diversified horizontally across Fortune 100 companies, mid-sized firms, multinational corporations, startups and individual inventors, and non-profits served pro bono. Headcount is in the 51-100 range, with revenue undisclosed publicly.

Name

Leason Ellis

Legal name

Leason Ellis LLP

Website

https://leasonellis.com

Company type

Private

Founded year

2008

Operating status

Operating

Headcount range

51–100 employees

Short description

Leason Ellis is a White Plains, New York-based full-service intellectual property law firm founded in 2008, serving Fortune 100 companies, multinationals, startups, and individual inventors across patent, trademark, copyright, and litigation matters with a technically credentialed attorney bench.

Ownership category

akta.pro rank

Product category

Intellectual Property Legal Services

NAICS

Offices of Lawyers (541110), Offices of Lawyers (54111), All Other Legal Services (541199)

SIC

Services-Legal Services (8111)

akta.pro primary industry

eDiscovery, Litigation Support & Legal Hold (BPAEAPAE)

akta.pro secondary industry

eDiscovery, Litigation Support & Expert Witness Services (BPAKAHAD)

Keywords

• Intellectual property law
• Patent prosecution services
• Trademark registration
• Copyright legal services
• IP litigation

Headquarters

HQ city

White Plains

HQ country

United States

HQ region

North America

Offices1 record

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Operations, Technology or R&D, Marketing or Sales, Infrastructure

Revenue model

1. Legal Services Billing: Leason Ellis generates revenue through professional legal services billed on hourly rates and retainer agreements. The firm handles patent prosecution, trademark registration, copyright matters, and litigation services for corporate and individual clients.

Pricing tiers

Go-to-market motion1 record

Distribution channels1 record

Marketing channels4 records

Core offering

Leason Ellis is a full-service intellectual property law firm providing patent prosecution, trademark registration, copyright protection, and IP litigation services. The firm serves clients ranging from Fortune 100 companies to individual inventors and startups, with attorneys holding advanced degrees in scientific and engineering disciplines to handle complex technical IP matters.

Product overview

Leason Ellis is a full-service intellectual property law firm offering a unified platform of legal services centered on protecting and enforcing intellectual property rights. The core service portfolio consists of four interconnected practice areas: Patent Services (including prosecution, portfolio management, and opinion work), Trademark Services (covering clearance, registration, monitoring, and enforcement), Copyright Services (registration, counseling, and litigation), and Litigation Services (handling disputes across all IP domains). These core services are supported by Technology Transactions practice for licensing matters, a Secure Payment Portal for client payments, and The Newtonian quarterly newsletter for industry insights. The firm's multidisciplinary approach enables cross-practice coordination for comprehensive IP protection strategies.

Differentiator

Problem solved

Functional benefit

Products and services

• Patent Services

Named customers5 records

Segments5 records

Ideal customer profiles5 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Partnerships

Six partnerships are on record, tiered minor and core.

• Alexandra's PlaygroundminorOthersLeason Ellis provides pro bono trademark/service mark registration services for Alexandra's Playground, a non-profit that builds playgrounds in underserved areas. The firm assisted in registering the organization's name and logo with the USPTO.
• Pro Bono PartnershipcoreOthersLeason Ellis partners with Pro Bono Partnership to provide free IP legal advice to non-profit organizations in Connecticut, New Jersey, and New York. Firm volunteers handle trademark and other IP matters for organizations focused on feeding the hungry, housing the homeless, promoting the arts, and protecting the environment.
• Volunteer Lawyers for the ArtscoreOthersLeason Ellis partners with Volunteer Lawyers for the Arts (VLA) to provide pro bono legal services for low-income artists and non-profit arts organizations. Attorneys advise on copyright claims, negotiate license agreements, and handle other IP issues.
• Save the ElephantsminorOthersPartner serves on Board of Trustees; firm provides pro bono trademark protection (U.S. and foreign), dispute resolution, and drafts license and promotional agreements for the non-profit.
• Center for Anti-Counterfeiting and Product Protection (A-CAPP)minorOthersLeason Ellis filed an amicus brief on behalf of A-CAPP (housed at Michigan State University) in Nike, Inc. v. Wu regarding third-party bank liability in anti-counterfeiting enforcement.
• Office of Pro Se Litigation, U.S. District Court for the Southern District of New YorkminorOthersFirm volunteers legal services to provide assistance to individuals representing themselves in federal court who cannot afford attorneys. Successfully represented fashion designers in LAVISH trademark case.

Scale indicators3 records

Recent moves7 records

Expansion highlights4 records

Direct peers

• Fish & Richardson: One of the largest U.S. patent prosecution and litigation boutiques. Directly comparable as a full-service IP firm serving Fortune 100 and tech/life sciences clients, but at substantially larger scale and multi-office footprint.
• Finnegan, Henderson, Farabow, Garrett & Dunner: Elite IP boutique consistently ranked in IAM Patent 1000 with deep technical-scientific bench. Highly comparable to Leason Ellis's patent prosecution and litigation model, though larger and DC-headquartered.
• Knobbe Martens: Major IP boutique with strong patent prosecution and litigation practices across life sciences, technology, and chemicals. Closely analogous to Leason Ellis's technical-degree-driven IP model.
• Wolf, Greenfield & Sacks: Boston-based IP boutique focused on patent prosecution and litigation in technology and life sciences. Comparable technical bench and full-service IP offering to Leason Ellis.
• Sterne, Kessler, Goldstein & Fox: Washington, DC IP boutique specializing in patent prosecution, litigation, and IPR proceedings. Directly comparable technical-degree attorney model and patent-focused practice.
• Oblon, McClelland, Maier & Neustadt: Alexandria, VA-based IP boutique focused on patent prosecution and litigation. Comparable full-service IP offering and recurring IAM Patent 1000 recognition.
• Lerner David Littenberg Krumholz & Mentlik: New Jersey-based IP boutique with similar patent prosecution, trademark, and litigation focus across technology and life sciences. Directly comparable boutique-scale IP specialist serving similar East Coast mid-market and enterprise clients.

Broad incumbents

• Cooley LLP: Major national law firm with a large, highly regarded IP practice serving technology and life sciences clients. Overlaps with Leason Ellis on patent prosecution and IP litigation, but as part of a broader corporate and litigation platform.
• Mintz: National law firm with significant IP prosecution and litigation capabilities alongside corporate, healthcare, and technology practices. Competes for similar Fortune 500 and emerging-company IP work.

Regional players

• McCarter & English: Northeast-based full-service firm with a substantial IP practice serving NY/NJ/CT clients. Geographically comparable regional competitor with overlapping white Plains corridor client base.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks6 records

Key highlights6 records

Customer concentration

• Xx.com/leasonellis
• Facebookfacebook.com/Leason-Ellis-LLP-181241209829
• LinkedInlinkedin.com/company/leason-ellis-llp

Revenue estimate

Valuation estimate

Number of profiles

Profiles4 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Leason Ellis