Mr Mark S. Cheffo > Dechert LLP > New York, United States > Lawyer Profile

Dechert LLP
Three Bryant Park, 1095 Avenue of the Americas
NEW YORK, NY 10036-6797
United States
Mark S. Cheffo photo

Work Department

Product Liability and Mass Torts


Mark S. Cheffo is co-chair of Dechert’s product liability and mass torts practice and has extensive experience serving as national coordinating and trial counsel in complex product liability, insurance and mass torts litigation. He acts for corporates and individuals in the pharmaceutical, medical device manufacturing, bioengineering, insurance and industrial products industries, amongst others. Mr. Cheffo has also handled numerous toxic and environmental exposure suits.

Mr. Cheffo has taken part in several trial teams in high-profile pharmaceutical litigation, managing all stages of a dispute from negotiation, through pre-trail proceedings to trial. In addition to defending expert and company witness depositions, Mr. Cheffo has briefed and conducted numerous Daubert and Frye challenges. He has also briefed and argued dispositive motions and appeals in state and federal courts throughout the United States. Mr. Cheffo also has considerable experience conducting arbitrations and mediations relating to disputes.


New York City Bar Association; International Association of Defense Counsel


Stony Brook University, B.A., with Honors, 1987, Pi Sigma Alpha National Political Science Honor Society, Phi Alpha Theta International History Honor Society; Boston University School of Law, J.D., 1990, Editor-in-Chief of American Journal of Law & Medicine, Paul J. Liacos Scholar

Lawyer Rankings

United States > Dispute resolution > Product liability, mass tort and class action - defense: pharmaceuticals and medical devices

With a strong East Coast presence and also continuing to strengthen its offering from California, the ‘engaging and responsive‘ team at Dechert LLP has the resources to handle a tremendous range and volume of major product liability disputes facing pharmaceutical/devices clients, irrespective of location. Much of the work the practice handles, however, is in the context of national counsel in large aggregated matters, where it adds real value, not only by dint of its strategic aptitude but also being ‘totally abreast of the underlying subject matter’. As well as their aptitude at trying cases, the attorneys are also very adept at securing excellent results for clients utilizing dispositive motions – including in the context of Daubert challenges. New York-based co-heads Mark S. Cheffo  and Sheila L. Birnbaum have amassed a huge amount of experience and success in the area, often in the role as national co-ordinating counsel and trial counsel. Managing partner of the Los Angeles office Kimberly Branscome also handles life sciences-related matters as part of her broad-based product liability skillset. ‘Calm and knowledgeable’ New York-based Rachel Passaretti-Wu is also recommended andgets great resultsfor clients.

United States > Dispute resolution > Leading trial lawyers

(Leading trial lawyers)

Mark S. CheffoDechert LLP

United States > Dispute resolution > Product liability, mass tort and class action - defense: toxic tort

Dechert LLP has strong market presence in the product liability and mass torts space from its East coast stronghold, as well as more recently from a burgeoning California-based offering – a corollary of which includes a significant amount of toxic tort work for consumer goods, chemicals, pharmaceuticals and manufacturing companies. The well-known practice c0-head, Sheila L. Birnbaum is well-versed in the relevant science, the substantive law and litigation strategies relating to a range of product liability/mass tort matters and has, throughout her career, achieved many notable victories at both a trial and appellate level. ‘Calm and knowledgeable‘ in her approach, Rachel Passaretti-Wu ‘gets results‘ for clients in toxic tort and product liability matters; she recently played key role for Saint-Gobain in toxic tort-related matters regarding its use of materials containing perfluorooctanoic acid (PFOA). Managing partner of the firm’s Los Angeles office, Kimberly Branscome has been pivotal to the firm’s growth on the West Coast. Mark S. Cheffo co-heads the team alongside Birnbaum. All named practitioners are based in New York, unless otherwise noted.