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Bill Gianaris

Office Managing Attorney

BBGianaris@mdwcg.com

Portrait of Bill Gianaris

Bill is a trial attorney who has litigated and tried numerous high-exposure cases in the fields of medical malpractice and general liability. He draws from his more than 20 years of experience in the area of medical malpractice defense to assist clients in achieving optimal outcomes.

As Managing Attorney and Casualty Supervisor, Bill oversees the daily operations of the office, including the supervision, mentorship, and performance management of legal and support staff. In addition to his managerial responsibilities, he ensures that all casualty matters are handled promptly, professionally, and effectively by the team of attorneys.

Bill has successfully defended a broad range of cases, including obstetrical, gynecological, surgical, oncological, pediatric, orthopedic, urologic, neurologic, gastrointestinal, psychiatric, ophthalmologic, emergency medicine, dental, podiatric and nursing. He has also represented health care providers in disciplinary hearings. Bill effectively defends clients from the inception of the case, laying the groundwork for success through motion practice, settlement and trial.

Prior to focusing his practice on medical malpractice defense, Bill worked as an Assistant District Attorney in Queens County in various bureaus, including Homicide/Investigations, Organized Crime, Appeals, Supreme Court Trial, and also as Chief of the Airport Investigations Unit. As an Assistant District Attorney, Bill tried numerous cases, argued appeals before the Appellate Division, and oversaw complex criminal investigations involving airport cargo theft and organized crime. He regularly lectured at training and education programs at the National Cargo Security Council, the Global Maritime Transportation School and the United States Merchant Marine Academy. He has also lectured before hospital staff regarding the defense of medical malpractice actions.

In addition to his firm responsibilities, Bill also serves as an Administrative Law Judge in Westchester County.

    • Fordham University School of Law (J.D., 1988)
    • New York University School of Law (LL.M., 1992)
    • Fordham University (B.A., summa cum laude, 1985)
    • New York, 1988
    • U.S. District Court Eastern District of New York, 1989
    • U.S. District Court Southern District of New York, 1989
    • Supreme Court of the United States, 2002
    • New York Metro Super Lawyer (2013-2014; 2017; 2021)
    • Hellenic Lawyers Association, Board Member 1998-present; President 1994-1998

News

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Firm Highlights

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Result

Defense Verdict in Complex Medical Malpractice Trial

Event

Pennsylvania Appellate Update 2025-2026

On August 21, 2026, Casey will serve as a panelist for the live webcast program, “Pennsylvania Appellate Update 2025-2026” presented by the Appellate Advocacy Committee of the Pennsylvania Bar Association and Pennsylvania Bar Institute. The program is divided into three parts—Criminal, Civil, and Administrative. Casey will serve as a panelist for the Civil portion, along with Christina McKinley of Blank Rome, Ben Baer of Injury Law Partners, John Masslon of Keller Postman, Jonathan Bruno of Bruno Litigation LLC, and moderator, Ezza Ahmed of Buchanan Ingersoll.  Registration and more information: https://www.pbi.org/product/pennsylvania-appellate-update-2025-2026/

Result

Summary Judgment Secured, Preserving $750,000 in Coverage for Insured in Major Trucking Liability Dispute

Ray Freudiger and Michael A. Roberts (both of Cincinnati) successfully obtained summary judgment on behalf of their client in a coverage dispute arising from a May 19, 2022, motor vehicle accident. A permissive driver operated a box truck for an interstate trucking company and caused severe injuries to two tort victims. Prior to the accident, the insured had procured a commercial auto policy for the trucking company with stated limits of $1,000,000. Following the accident, the insurer initiated a declaratory judgment action asserting that only reduced bodily injury limits of $25,000/$50,000 applied and later counterclaimed, alleging it would not have insured the driver had he been properly submitted for approval under the policy. After extensive discovery, briefing, and oral argument, the court rejected the insurer’s attempt to shift responsibility for the $750,000 in coverage it was legally required to provide for permissive drivers under Ohio law, granting summary judgment in favor of the insured and preserving $750,000 in liability exposure.

Marshall Dennehey Announces 2026 Ohio Super Lawyers and Rising Stars

News

Marshall Dennehey Announces 2026 Ohio Super Lawyers and Rising Stars

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Result

Summary Judgment Secured for Life Insurance Agent

Thought Leadership

A Unified, Single Claim for Damages Requires Apportionment in a Joint Proposal: What the Decision in 'Trace Elements' Means for Property Insurance Claims

Kimberly and Seth, shareholders in the Insurance Services Practice in our Fort Lauderdale office, break down the Florida Supreme Court's decision in 'Trace Elements v. MacKensen' and what it means for property insurance claims in the state. Read the article here.

Portrait of Carolyn Schweizer, with text below: Philadelphia Office Managing Attorney

News

Marshall Dennehey Names Carolyn Schweizer New Philadelphia Office Managing Attorney

Jason Banonis Holds PDI Attorney of the Year Award with the PDI President

News

Jason Banonis Named Attorney of the Year by the Pennsylvania Defense Institute

Thought Leadership

Fla. Workers' Comp Physician Dispensing Ruling Could Produce New Legislative Fight

In a significant decision issued on February 25, 2026, the First District Court of Appeal (DCA) ruled in Publix Super Markets, Inc., et al. v. Department of Financial Services, et al., 430 So. 3d 252 (Fla. 1st DCA 2026), that while injured workers have an absolute right to choose their own pharmacy or pharmacist, that right does not extend to physicians who dispense medications directly to their patients.  Read Blake's article in Insurance Journal: https://www.insurancejournal.com/news/southeast/2026/08/05/880229.htm. 

Thought Leadership

Appellate Division Affirms Dismissal of Legal Malpractice Counterclaim Against Martin Law Firm

In Martin v. Loury, 2026 N.J. Super. Unpub. LEXIS 1617 (App. Div. July 15, 2026), Martin Law Firm represented Kirk Loury in an employment matter Mr. Loury filed against his former employer, Concord Equity Group Advisors LLC (“Concord”). The allegations included, among other things, that Loury was not fairly compensated for his employment with Concord. After a bench trial finding in Loury’s favor, the Appellate Division remanded this matter in February 2016 for a second trial. During the second trial, Concord CEO, Lee Argush, testified to lower compensation estimate than first trial. On remand, the second trial judge awarded Mr. Loury the same damages as the first judge, finding Mr. Argush not credible. After the findings during the second trial, Martin Law Firm filed an action against Mr. Loury to recover legal fees and costs of representing Mr. Loury in a second bench trial and Mr. Loury filed a counterclaim against Martin Law Firm for legal malpractice, alleging he should have received an even higher award in the second bench trial. In this allegation, Mr. Loury, through his expert, claimed that Martin Law Firm should have recalled Mr. Loury to the stand to rebut Mr. Argush’s testimony to allege an alternative theory of damages. Mr. Loury’s expert admitted that the second judge already rejected Mr. Argush's theory and accepted Loury's damages theory. The trial court barred Mr. Loury’s expert and dismissed Loury's counterclaim with prejudice before convening the collection trial, and the jury ruled in Martin Law Firm’s favor. Mr. Loury appealed the trial court's pretrial rulings barring his liability expert from testifying in support of his legal malpractice counterclaim, denying his motion for summary judgment on that counterclaim, and denying his motion to amend his counterclaim by adding attorney Joseph A. Martin as a codefendant. In affirming the trial court’s decision, the Appellate Division held that the trial court properly excluded Loury’s expert testimony in the counterclaim against Martin Law Firm because the expert could not explain how calling Loury as a rebuttal witness would have increased damages when the second judge already rejected Mr. Argush's testimony and accepted Loury's damages theory, making the expert’s causation opinion speculative. The Appellate Division also held that the trial court properly denied Mr. Loury's summary judgment motion on his malpractice counterclaim because reasonable minds could differ on whether Mr. Martin's alleged failures would have changed the second judge's damages award, given the judge already found Mr. Argush not credible, creating genuine factual disputes precluding summary judgment. Also, the Appellate Division held that the trial court properly denied Loury's May 2023 motion to add Joseph Martin individually because the statute of limitations expired in February 2022, six years after the 2016 appellate remand when Mr. Loury incurred new legal costs, and relation back did not apply because Mr. Loury knew Mr. Martin's identity throughout and strategically chose to sue only Martin Law Firm in his 2019 counterclaim.