Zimmer, Citron & Clarke

What Zimmer, Citron & Clarke does

Zimmer, Citron & Clarke is a plaintiff-side appellate litigation boutique founded in 2025 by three partners — David Zimmer and Edwina Clarke, formerly of Goodwin Procter's Supreme Court and Appellate practice, and Eric Citron, formerly of Gupta Wessler and Goldstein & Russell. The firm is organized as a limited liability partnership (Zimmer, Citron & Clarke LLP) and is independently owned by its founding partners, with no institutional or PE backing. It represents clients at every level of the federal and state judiciaries and has handled nearly a dozen merits cases at the United States Supreme Court since launch. The firm operates from three offices — Boston (711 Atlantic Avenue), Washington, DC (14 Ridge Square NW), and Madison, WI (345 West Washington Avenue) — providing geographic coverage across the Northeast, Mid-Atlantic, and Midwest.

The firm's service offering spans six practice areas: Antitrust, Securities, Personal Injury, Mass Torts, Intellectual Property, and Immigration. Its core operating model is co-counsel and referral partnerships with leading trial lawyers across the country, rather than direct client origination; the firm positions itself as a strategic appellate partner for plaintiff-side trial firms handling high-stakes matters, providing representation on appeal, complex motions practice, post-judgment briefing, and district court co-counsel work. Practice-area depth includes plaintiffs' antitrust appellate work, securities appeals, defense of significant verdicts in personal injury and product liability cases, leadership roles in mass tort MDLs, patent appeals in the Federal Circuit, and immigration appellate work including five SCOTUS arguments.

Revenue is generated through professional legal services billed on a matter-by-matter basis for plaintiffs-side litigation, with no subscription, recurring, or volume-based pricing. Pricing is negotiated case-by-case and not publicly disclosed. The firm's go-to-market relies on direct relationships with trial firms, earned media coverage in legal publications (Law360, Bloomberg Law, NY Times, Politico), and partner LinkedIn profiles. Eric Citron's concurrent role as managing director at TRGP Capital, a litigation finance fund, embeds the firm in the litigation finance ecosystem for case sourcing and evaluation. The firm has also launched a 1–2 year Litigation Fellowship Program (Boston or DC, 2027 start) to build a talent pipeline.

Name

Zimmer, Citron & Clarke

Legal name

Zimmer, Citron & Clarke LLP

Website

https://zimmercitronclarke.com

Company type

Private

Founded year

2025

Operating status

Operating

Headcount range

1–10 employees

Short description

Zimmer, Citron & Clarke is a plaintiff-side appellate litigation boutique founded in 2025, serving high-stakes matters across federal and state courts including the U.S. Supreme Court. It partners with trial firms nationwide across antitrust, securities, personal injury, mass tort, IP, and immigration appeals.

Ownership category

akta.pro rank

Product category

Appellate Legal Services

NAICS

Offices of Lawyers (541110), Legal Services (5411)

SIC

Services-Legal Services (8111)

akta.pro primary industry

Litigation & Dispute Resolution (BPAHAAAB)

akta.pro secondary industry

Mergers & Acquisitions (M&A) & Securities Law (BPAHAAAI)

Keywords

• Appellate litigation services
• Supreme Court advocacy
• Plaintiff-side appeals
• Complex motion practice
• Litigation boutique services

Headquarters

HQ city

Boston

HQ country

United States

HQ region

North America

Offices3 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Operations, Marketing or Sales

Revenue model

1. Legal Services: The firm provides legal representation in high-stakes appellate litigation, Supreme Court cases, and complex civil matters. Revenue is generated through professional legal services billed to clients, typically on a matter-by-matter basis for plaintiffs-side litigation.

Go-to-market motion1 record

Distribution channels1 record

Marketing channels3 records

Core offering

Zimmer, Citron & Clarke is a plaintiff-side litigation boutique providing appellate advocacy, complex motions practice, and Supreme Court representation across antitrust, securities, personal injury, mass tort, intellectual property, and immigration matters. The firm partners with leading trial lawyers nationwide as co-counsel and serves plaintiffs in high-stakes cases in federal and state appellate courts. It has handled nearly a dozen merits cases at the United States Supreme Court.

Product overview

Zimmer, Citron & Clarke is a litigation boutique law firm offering specialized legal services as a unified practice focused on appeals and motions practice in high-stakes matters. The firm provides services across six core practice areas: Antitrust, Securities, Personal Injury, Mass Torts, Intellectual Property, and Immigration, representing clients at every level of the federal and state judiciaries including nearly a dozen merits cases at the United States Supreme Court. The firm also operates a Litigation Fellowship Program for emerging attorneys.

Differentiator

Problem solved

Functional benefit

Segments2 records

Ideal customer profiles2 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Scale indicators3 records

Recent moves5 records

Expansion highlights5 records

Direct peers

• Susman Godfrey LLP: Elite national litigation boutique with strong appellate practice, frequently handling bet-the-company cases and high-stakes appeals for plaintiffs. A direct competitor for sophisticated plaintiff-side trial and appellate mandates.
• Cohen Milstein Sellers & Toll PLLC: Plaintiff-side litigation firm with strong appellate capabilities, particularly in antitrust, securities, and consumer protection—overlapping several of ZCC's core practice areas and a likely competitor for plaintiff-side appellate mandates.
• Goldstein & Russell PC: Elite Washington DC appellate boutique where Eric Citron also worked before founding ZCC. Specializes in Supreme Court and federal appellate litigation, often serving as co-counsel to trial firms—the same partnership model ZCC replicates.
• Motley Rice LLC: Plaintiff-side litigation firm with significant mass tort, personal injury, and appellate capabilities—directly overlapping ZCC's mass torts and personal injury appellate practices.
• Gupta Wessler PLLC: Plaintiff-side appellate boutique in Washington DC where co-founder Eric Citron previously worked. Same core practice model: complex appellate and Supreme Court advocacy for plaintiffs across antitrust, securities, consumer protection, and constitutional matters.
• Kellogg, Hansen, Todd, Figel & Frederick, PLLC: One of the most prominent appellate litigation boutiques in Washington DC, handling Supreme Court and complex appellate matters for major clients. Competes with ZCC for high-stakes appellate mandates requiring specialized advocacy.

Broad incumbents

• Quinn Emanuel Urquhart & Sullivan, LLP: Large global litigation firm with deep appellate bench and Supreme Court practice. Competes for high-stakes appellate mandates and offers broader scale across practice areas and geographies.
• Boies Schiller Flexner LLP: Major litigation firm with a substantial appellate practice, frequently representing plaintiffs in high-stakes disputes. Competes with ZCC for complex civil and appellate mandates from sophisticated clients.

Market position

Strengths4 records

Weaknesses4 records

Competitive moat4 records

Key risks6 records

Key highlights7 records

Customer concentration

Revenue estimate

Valuation estimate

Number of profiles

Profiles3 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 Zimmer, Citron & Clarke