Pennsylvania Office
T: 484-344-5332
C: 215-512-8302
F: 484-344-5341
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Blue Bell Executive Campus
470 Norristown Road, Suite 201
Blue Bell, Pennsylvania 19422
New York Office
T: 212-858-9970
F: 212-858-9971
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Time & Life Building
1271 Avenue of The Americas, 4300,
New York, NY 10020

Susan M. Unger - Administrative Assistant
T: 484.344.5330
Catherine R. Reed - Paralegal
T: 484.344.5328

Greg A. Delfiner has over a decade of experience in complex litigation. A significant portion of his practice involves representing clients in connection with insurance coverage issues and disputes, and liability defense matters, including those arising out of underlying mass tort claims, bad faith/extra-contractual claims, professional liability/errors and omissions, product liability and construction defect claims. Greg has extensive experience drafting dispositive and discovery motions and handling all aspects of the discovery process in connection with large, complex insurance coverage and class action cases. Greg has been admitted pro hac vice in several jurisdictions throughout the United States and serves as an arbitrator for civil cases in the Court of Common Pleas of Montgomery County, Pennsylvania.

Professional Experience

Before joining Stewart Bernstiel Rebar & Smith, Greg practiced in the Global Insurance Group of the Litigation Department of Cozen O’Connor, served on the legal staff for Pennsylvania Senate President Pro Tempore Robert C. Jubelirer, and clerked for the Honorable Edward E. Naythons, United States District Court for the Eastern District of Pennsylvania.


Greg earned his J.D. from Delaware Law School in Delaware and his bachelor’s degree in accounting from Temple University.

Primary Practice Areas

Bad Faith


Complex Litigation


Contribution  Subrogation


Construction Defect




First Party Coverage


Third Party Coverage

Representative Matters

R.T. Vanderbilt Co., Inc. v. Hartford Accident & Indemnity Co., et al., Connecticut Superior Court, Judicial District of Waterbury, Complex Litigation Dep’t, No. X02-UWYCV-07-5016321 (assisted lead trial counsel for 28 insurers in insurance coverage declaratory judgment and breach of contract action involving underlying asbestos, silica and talc-related claims)

In re Human Tissue Products Liability Litigation, United States District Court, District of New Jersey, No. 2:06-cv-00135 (assisted national and coordinating counsel for over four years in the successful defense of an allograft manufacturer in a complex mass tort claim arising out of the FDA’s recall of bone allograft tissue involving more than 1,000 plaintiffs nationwide in multiple state and federal jurisdictions; summary judgment granted for lack of general causation)

Bar Memberships & Court Admissions
  • Pennsylvania
  • New York
  • U.S. District Court for the Eastern District of Pennsylvania
Professional Affiliations and Professional Organizations
  • New York Bar Association
  • Pennsylvania Bar Association
  • Philadelphia Bar Association
  • Montgomery County Bar Association
  • Defense Research Institute
  • Insurance Society of Philadelphia
Published Works

Bad Faith Claims Permitted Against Self-Insured Employers In Iowa – “Fairly Debatable” Defense Precludes Finding This Time [Avoiding Insurance Bad Faith Blog], June 17, 2013

Ever Had A Common Law Bad Faith Claim Dismissed? [Avoiding Insurance Bad Faith Blog], June 12, 2013

Bad Faith Claims Cannot Be Based Solely On Breach Of Contract And Must Allege More Than Conclusory Allegations [Avoiding Insurance Bad Faith Blog], March 20, 2013

New York Court Upholds Denial of Coverage Where Policyholders Breached D&O Policy’s Consent-to-Settle Provision [Insurance Coverage Alert!], October 17, 2011

Third Circuit Confirms That Pennsylvania CGL Insurers Have No Duty to Defend Claims Arising From Contractor’s Faulty Workmanship and Resulting Foreseeable Damages [Insurance Coverage Alert!], June 15, 2010

Charitable & Civic Involvement and Personal Interests

Pro Bono Attorney for underprivileged clients through Philadelphia VIP, an organization promoting equal justice for the impoverished (May 2013 Volunteer of the Month)

Volunteers and fosters dogs through the non-profit organization Wags Rescue

Youth baseball and basketball coach