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Conrad O'Brien


7 ranked lawyersBand 2PennsylvaniaUSA 2021 View ranking table
chambers review
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Ranked Lawyers
chambers review
department information
Ranked Lawyers

Chambers Review

Chambers Research is conducted by 200 Research Analysts, across 200 jurisdictions and provides nearly 6,000 rankings tables. Annually we collect hundreds of thousands of responses from clients, the majority via in-depth interview. Learn more about our methodology.

What the team is known for

Distinguished boutique with a formidable bench of experienced trial lawyers. Excels in legal malpractice cases and also noted for its assured counsel in insurance, antitrust, trade secret and employment disputes. Adept at advising on SEC investigations. Offers niche expertise representing religious institutions against sexual abuse allegations.


One interviewee states: "They're exceptionally skilled, terrifically capable in litigation and legal advice. They bring an extraordinarily extensive expertise."

"They're very good," comments a source. "They're always prepared, they know things that are current and they are very competent and reliable."

Interviewees describe the team as "strategic and tenacious."

Work highlights

Defended ScottCare Corporation against patent infringement claims brought by CardioNet regarding mobile cardiac telemetry patents.

Notable practitioners

Howard Klein acts on behalf of law firms and healthcare sector clients in malpractice matters, as well as advising on product liability.
"Really good counselor and advocate. He is a guy who sees the big picture and brings good insight and strategy to helping the client achieve its goals." "Howard Klein is an excellent attorney."

James Rohn chairs the firm and is also a highly respected litigator. He has a wealth of experience in working on complex white-collar criminal cases and government investigations.
"He brings a true expertise to tackling our work." "He is as fine an attorney as you could find."

John Guernsey has experience in handling commercial litigation with a focus on trade secrets and post-employment restrictions. His expertise also extends to ADR proceedings.

Kevin Kent is highlighted for his expertise in litigation relating to M&A activity. He has experience acting for utilities, as well as clients in the pharmaceutical and life sciences sectors.
"Kevin is highly intelligent, very strategic and always practical." "He's experienced, levelheaded and insightful."

Nancy Gellman is a founding partner of the firm and currently acts as its vice chair. She has a wealth of litigation experience and advises on a broad range of commercial disputes.

Nicholas Centrella is the firm's managing partner. He has a wide-ranging practice which sees him representing law firms in legal malpractice cases, as well as assisting other clients with antitrust and product liability matters.
"I think Nicholas Centrella is one of the best jury trial lawyers in Philadelphia."

Patricia Hamill is a specialist in Title IX litigation and regularly advises current and former students on claims in that area.
"She's excellent and extremely talented." "She is an excellent civil litigator with the full range of trial skills."

Department Information

This content is provided by Conrad O'Brien.


Conrad O’Brien is a Philadelphia-based litigation boutique.  Founded in 1984 by three litigation attorneys from a major Philadelphia law firm, Conrad O’Brien has established itself as the insider’s law firm—winning bet-the-company cases for AmLaw 100 firms and Fortune 500 companies, as well as high-stakes cases for government entities and individuals.  We tackle complex cases with tenacity and serve clients with responsiveness and integrity. Our uniquely agile, collaborative approach to litigation allows us to solve client's problems. Whether it’s successfully taking a case to trial or preventing legal problems before they occur, we perform with the smarts and tenacity of a special-ops team. Conrad O’Brien handles cases in these key practice areas: Commercial Litigation; Education Law; Employment Law; Government Relations; Products Liability & Complex Torts; Professional & Fiduciary Litigation; White Collar & Internal Investigations; and Title IX & Campus Discipline.


"John Doe"(s) in Title IX Litigation

AmLaw 100 law firms

Archdiocese of Philadelphia

Chester Water Authority

Children’s Hospital of Philadelphia

Country View Family Farms, LLC

Farmers Insurance Group of Companies

Illinois Tool Works

Lorillard Tobacco Company


Micro Focus

ScottCare Corporation, a Berkshire Hathaway company

The Dow Chemical Company



Commercial & Professional Services

Construction & Materials


Financial Services


Health Care


Life Sciences

Private Clients / Individuals

Software & Computer Services

Technology, Hardware & Electronics


Title IX




Conrad O'Brien


1500 Market Street

Centre Square

West Tower, Suite 3900




PA 19102-2100

View Firm Profile

Ranked Lawyers

Chambers Research is conducted by 200 Research Analysts, across 200 jurisdictions and provides nearly 6,000 rankings tables. Annually we collect hundreds of thousands of responses from clients, the majority via in-depth interview. Learn more about our methodology.


Litigation: White-Collar Crime & Government Investigations

James J Rohn
Eminent Practitioners
Pennsylvania: Philadelphia & Surrounds

Litigation: General Commercial

Howard M Klein
Band 3
John Guernsey
Band 4
Nancy J Gellman
Senior Statespeople
Nicholas M Centrella
Band 2

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