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Sean P. Greenwalt

Portrait of Sean P. Greenwalt

Sean is a shareholder in the firm’s Casualty Department where he focuses his practice on amusement, sports, and recreation matters as well as fraud and personal injury protection disputes. Sean litigates a variety of complex matters on behalf of corporations involving premises liability, commercial auto liability, catastrophic loss, wrongful death and commercial contract disputes. He also has experience defending first-party auto coverage suits and conducting examinations under oath.

Sean is a member of the Florida Defense Lawyers Association and Claims Litigation Management Alliance. He routinely writes articles and presents on legal developments in the insurance industry, and has also been published in Insurance Journal. Sean also volunteers as a Guardian ad Litem child advocate in Hillsborough County.

Prior to joining Marshall Dennehey, Sean worked as outside counsel for a national automobile insurance company and previously worked as in-house counsel for a national automobile insurance company. Before working in civil litigation, Sean was an attorney for Florida's Department of Children and Families, where he successfully litigated countless legal issues and obtained numerous successful bench trial verdicts that protected the vulnerable and allowed children to become adopted.

Sean earned his juris doctor and graduated magna cum laude from Ave Maria School of Law in Naples, Florida. During law school, Sean served as an Associate Editor on Law Review and a member of the Moot Court Board. He also was a Judicial Intern for the Honorable Judge Douglas Frazier of the US District Court, Middle District of Florida. Sean obtained his Bachelor of Arts degree from Old Dominion University where he was inducted into the honor society for Communication majors, Lambda Pi Eta.

    • Ave Maria School of Law (J.D., magna cum laude, 2016)
    • Old Dominion University (B.A., 2012)
    • Florida, 2016
    • U.S. District Court Middle District of Florida, 2023
    • Florida Bar Association
    • Florida Defense Lawyers Association
    • Claims & Litigation Management Alliance (CLM) Western Florida Chapter
    • Asian Pacific American Bar Association of Tampa Bay (APABA-TB)
    • A Proposal for Settlement for All Seasons: Effective Use of the PFS in Florida’s New Legal Landscape, Florida Liability Claims Conference, Lake Buena Visit, FL, June 18, 2025
    • First Party Auto (PIP) and Property Year in Review Preview, The Institutes CPCU Society - Central Florida Chapter, November 14, 2024
    • Guardian ad Litem, Hillsborough County

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Thought Leadership

SIU Spotlight

Florida Appellate Court Sets Record Straight on Longtime Misconception of Examinations Under Oath as Admissible Evidence

May 15, 2026

The Florida Third District Court of Appeal recently overturned a long standing assumption regarding the admissibility of examinations under oaths (“EUOs”) as trial evidence in Universal X Rays, Corp. v. United Auto. Ins. Co., 422 So. 3d 1203 (Fla. 3d DCA 2025), reh'g denied (Nov. 3, 2025). For years, a longstanding mythos existed around EUOs in Florida that they could not be used in litigation because of a multitude of reasoning: hearsay, trustworthiness, due process, creation in anticipation of litigation, among other common critiques. Such was the situation that great evidence could be potentially unearthed in an EUO, but if it could not be independently verified by other means, certain evidence as to fraudulent or denied coverage claims would never see the light of day. In Universal X Rays, the assignee and insured, Miguel LaRosa-Ferrer sat for an examination under oath per his insurance policy following a car accident. The EUO was conducted via videoconference with a court reporter and the insured had an attorney present. During the required examination, the insured admitted that he had moved to a new address shortly before applying for the insurance policy but continued to list his old address on the application. This resulted in a lower premium for the insured. Two months later, United Auto sent a letter to the insured rescinding the policy, citing material misrepresentation of the garaging address, and returned the premium. Several months later, the appellant, Universal, sued United Auto for breach of contract after it denied a medical billing reimbursement request for no-fault personal injury protection benefits. United Auto eventually moved for summary judgment on the issue of material misrepresentation with its key piece of evidence being the EUO transcript. Universal argued that the EUO transcript was inadmissible as improper hearsay, an out of court statement by a declarant offered for its truth, and that it violated section 92.33, Florida Statutes (2025) because the insurer did not provide a copy of the transcript to the insured. However, Universal offered no actual evidence disputing that the insured committed a material misrepresentation. The lower trial court disagreed with Universal’s legal arguments and because no evidence disputing the material misrepresentation was presented, entered final judgment for United Auto. Unsurprisingly, Universal promptly appealed, as there is a history of trial courts in Florida finding EUOs to be inadmissible for numerous reasons leading to a long fabled belief in the industry as to the same. For example, in JJZ Medical Center, Inc., v. United Auto. Ins. Co., 32 Fla. L. Weekly Supp. 432a, (Fla. 11th Jud. Cir. Cty. 2024), a Miami-Dade trial court declined to review an examination under oath demonstrating material misrepresentation after an insured signed an affidavit to the contrary and it was submitted as evidence. The court held that the EUO could not be admissible because there was no cross-examination of the witness making it “inherently untrustworthy.” The court went on to state that an EUO transcript met no exception to hearsay exclusions under Florida law either such as former testimony or a business records exception. Another County Court in Miami-Dade excluded an EUO transcript involving a material misrepresentation summary judgment because it was not provided to the declarant nor adopted by the declarant per § 92.33 Fla. Stat, and would be considered hearsay. Manuel V. Feijoo, M.D., aao Andisleydis Sordo Perez v. United Auto. Ins. Co., 31 Fla. L. Weekly Supp. 382a (Fla. 11th Jud. Cir. Cty. 2023). In this case, the court honed in on the argument that an examination under oath, while sworn, lacks personal knowledge of the declarant because it is not provided to them, nor do they adopt it after it is transcribed. § 92.33 Fla. Stat requires a written statement by an injured party to be provided to that individual or it may not be used in a later civil action. The court held this statute to applicable and, thus, excluded the EUO transcript. Both of these common lower court arguments were then brought up on appeal by Universal. They argued to the Third District Court of Appeal that the EUO was inadmissible hearsay, violating Florida Statute § 92.33, which requires a copy of a written statement to be provided to the declarant. However, Third District Court of Appeal rejected both arguments and for a reason that seemed to catch the appellant off-guard. First, the court cited Florida’s revised summary judgment standard, which in 2021, aligned Florida’s Rule 1.510 with the federal summary judgment standard Rule 56. Using the full benefit of federal case law, the court held that hearsay is permissible “as long as it can” be presented in admissible form at trial—such as through live testimony. In such instances, the proper response from an opposing party is to present conflicting evidence of the statement. However, in this case, Universal put forth no evidence that the insured’s garage address was not materially misrepresented, and, thus, they lost this issue. The Third District rejected the argument that the insurer violated § 92.33 Fla. Stat., noting that the statute only requires “written statements” to be provide to an injured person. The court held that an EUO, which is a sworn transcribed statement, would not even be covered by § 92.33, and the appellant failed to provide any authority to the contrary. Given that appellant’s statutory argument did not apply and it presented no evidence to contradict the examination under oath, which could be reduced to admissible form at trial, the Third District affirmed the admissibility of the EUO in favor of the insurer. The significance of the Universal X Rays opinion now means EUOs are an even stronger fraud deterrent in Florida. They can be taken with confidence and utilized to stem frivolous litigation and claims at much earlier phases than before. Rather than ignore the EUO transcript, opposing parties now must affirmatively disprove that fraud has occurred once it is admitted.

Arbitration Near and Far: Fla.’s Fifth District Court of Appeal Issues Guidance for Arbitration Scope Disputes

December 3, 2025

In Urban Air Jacksonville v. Hinton, Florida’s Fifth District Court of Appeal clarified the standard for determining the scope of an arbitration agreement in a dispute over whether activity was related or unrelated to an overall contractual agreement.

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106 Marshall Dennehey Attorneys Recognized in the 2027 Editions of The Best Lawyers in America® and the Best Lawyers: Ones to Watch® in America

Marshall Dennehey is proud to highlight the firm’s 106 attorneys who have been recognized in the 2027 editions of The Best Lawyers in America® and the Best Lawyers: Ones to Watch® in America. Less than 6% of all practicing lawyers in the U.S. were selected by their peers for this recognition. Additionally, four of the firm’s attorneys received the Best Lawyers® 2027 “Lawyer of the Year” awards in their respective practice areas and demographic regions. Since it was first published in 1983, Best Lawyers® has become universally regarded as the definitive guide to legal excellence. Best Lawyers lists are compiled based on an exhaustive peer-review evaluation. For more information, please visit https://www.bestlawyers.com/. OUR 2027 LAWYERS OF THE YEAR Harrisburg, PA Christopher Reeser, Personal Injury Litigation - Defendants Kacey Wiedt, Workers Compensation Law - Employers Roseland, NJ Justin F. Johnson, Medical Malpractice Law - Defendants Leonard Leicht, Personal Injury Litigation - Defendants   OUR 2026 BEST LAWYERS IN AMERICA Philadelphia, PA Nicholas D. Bowers, Personal Injury Litigation - Defendants Josh J. T. Byrne, Professional Malpractice Law - Defendants Jefferey J. Chomko, Insurance Law James H. Cole, Insurance Law John J. Delany III, Personal Injury Litigation - Defendants Laurianne Falcone, Personal Injury Litigation - Defendants John P. Gonzales, Employment Law - Management John Hare, Appellate Practice Daniel D. Krebbs, Personal Injury Litigation - Defendants Michele Punturi, Workers' Compensation Law - Employers Bradley D. Remick, Product Liability Litigation - Defendants Andrea Cicero Rock, Workers' Compensation Law - Employers Robin M. Romano, Workers' Compensation Law - Employers Daniel J. Ryan, Jr., Personal Injury Litigation - Defendants Gary M. Samms, Professional Malpractice Law - Defendants Christopher N. Santoro, Personal Injury Litigation – Defendants; Product Liability Litigation -Defendants Josh D. Scheets, Personal Injury Litigation - Defendants Robert P. Schenk, Workers' Compensation Law - Employers Robert E. Smith, Insurance Law Robin Snyder, Litigation - Health Care Michael L. Turner, Commercial Litigation; Criminal Defense: White-Collar; Mass Tort Litigation / Class Actions - Defendants Claire Breaux Ventola, Product Liability Litigation - Defendants Pittsburgh, PA Melissa Devich Cochran, Commercial Litigation; Mass Tort Litigation / Class Actions – Defendants; Product Liability Litigation - Defendants  John F. Deasy, Personal Injury Litigation – Defendants; Product Liability Litigation - Defendants Daniel W. Deitrick, Workers' Compensation Law - Employers Douglas C. LaSota, Litigation - Construction; Mass Tort Litigation / Class Actions - Defendants Joseph V. Lesinski, Product Liability Litigation – Defendants   Christian D. Marquis, Personal Injury Litigation - Defendants Patricia A. Monahan, Insurance Law; Litigation - Insurance Patrick T. Reilly, Commercial Litigation; Mass Tort Litigation / Class Actions – Defendants; Product Liability Litigation - Defendants Brett C. Shear, Medical Malpractice Law - Defendants Teresa O. Sirianni, Education Law; Employment Law – Management; Litigation - Labor and Employment Stuart Sostmann, Product Liability Litigation – Defendants Danielle M. Vugrinovich, Mass Tort Litigation / Class Actions - Defendants Scranton, PA Sarah E. Argo, Litigation - Insurance Michael J. Connolly, Personal Injury Litigation – Defendants; Professional Malpractice Law - Defendants Matthew Keris, Litigation - Health Care; Medical Malpractice Law - Defendants John T. McGrath, Jr., Insurance Law; Medical Malpractice Law – Defendants; Product Liability Litigation - Defendants William J. McPartland, Insurance Law John R. Nealon, Product Liability Litigation - Defendants Victoria Scanlon, Health Care Law; Litigation - Health Care; Medical Malpractice Law - Defendants Michael A. Sebastian, Workers' Compensation Law - Employers Thomas A. Specht, Insurance Law; Litigation - Insurance Suzanne Tighe, Litigation Insurance Harrisburg , PA Casey Alan Coyle, Administrative/Regulatory Law; Appellate Practice; Commercial Litigation Brittany E. Bakshi, Personal Injury Litigation - Defendants Shannon P. Fellin, Workers' Compensation Law - Employers Allison Krupp, Insurance Law John R. Ninosky, Litigation – Insurance; Personal Injury Litigation - Defendants Christopher Reeser, Personal Injury Litigation - Defendants Kacey Wiedt, Workers' Compensation Law – Employers King of Prussia, PA  Michael L. Detweiler, Construction Law Joseph L. Hoynoski III, Medical Malpractice Law - Defendants Gregory J. Kelley, Construction Law, Litigation - Construction Anthony Natale III, Workers' Compensation Law - Employers Francis X. Wickersham, Workers' Compensation Law - Employers A. Judd Woytek, Workers' Compensation Law – Employers Erie, PA Patrick M. Carey, Personal Injury Litigation - Defendants Joel M. Snavely, Health Care Law; Insurance Law New Haven, CT Michael Wrona, Commercial Litigation, Litigation - Bankruptcy  Mount Laurel, NJ David D. Blake, Litigation - Insurance Barbara Davis, Personal Injury Litigation - Defendants Lynne Nahmani, Litigation - Health Care John H. Osorio, Personal Injury Litigation - Defendants John L. Slimm, Legal Malpractice Law – Defendants; Professional Malpractice Law – Defendants Roseland, NJ Robert T. Evers, Medical Malpractice Law - Defendants Justin F. Johnson, Medical Malpractice Law - Defendants Julia Klubenspies, Medical Malpractice Law - Defendants Leonard C. Leicht, Personal Injury Litigation - Defendants Patricia M. McDonagh, Appellate Practice Sunny Sparano, Litigation - Construction Randall S. Watts, Health Care Law New York, NY Tonya M. Lindsey, Medical Malpractice Law - Defendants Tampa, FL Michael Archibald, Personal Injury Litigation - Defendants Lindsay G. McCormick, Litigation – Construction Orlando, FL Thomas F. Brown, Personal Injury Litigation - Defendants Dante C. Rohr, Commercial Litigation Fort Lauderdale, FL Kimberly Kanoff Berman, Appellate Practice Patrick M. Delong, Personal Injury Litigation – Defendants Jacksonville, FL  Heather Byrer Carbone, Workers' Compensation Law - Employers Linda Wagner Farrell, Workers' Compensation Law - Employers Elizabeth B. Ferguson, Litigation - Construction James P. Hanratty, Personal Injury Litigation – Defendants Wilmington, DE Sarah B. Cole, Litigation - Insurance Benjamin K. Durstein, Workers' Compensation Law - Employers Maria R. Granaudo, Medical Malpractice Law - Defendants  Keri L. Morris-Johnston, Workers' Compensation Law - Employers Cincinnati, OH Timothy B. Schenkel, Personal Injury Litigation - Defendants David E. Williamson, Personal Injury Litigation - Defendants Cleveland, OH Vincent E. Cononico, Litigation – Insurance, Personal Injury Litigation - Defendants Jillian L. Dinehart, Personal Injury Litigation - Defendants David J. Fagnilli, Insurance Law Jason P. Ferrante, Health Care Law, Litigation - Health Care Andrew H. Isakoff, Transportation Law Leslie M. Jenny, Litigation - Health Care; Medical Malpractice Law – Defendant OUR 2026 BEST LAWYERS: ONES TO WATCH Jacksonville, FL Sean J. Reeves, Personal Injury Litigation – Defendants; Product Liability Litigation - Defendants Orlando, FL Carolin A. Pacheco, Insurance Law Mount Laurel Stacey Gorin, Insurance Law Melville, NY Kimberly Gitlin, Personal Injury Litigation – Defendants Matthew A. Gray, Insurance Law; Personal Injury Litigation - Defendants Philadelphia, PA Holli K. Archer, Health Care Law; Medical Malpractice Law – Defendants; Professional Malpractice Law Emily Pritchyk, Commercial Litigation; Product Liability Litigation – Defendants Pittsburgh, PA Taylor E. Kosko, Mass Tort Litigation / Class Actions – Defendants; Personal Injury Litigation - Defendants Alana Staniszewski, Workers' Compensation Law - Employers Michael D. Winsko, Product Liability Litigation – Defendants; Transportation Law King of Prussia, PA Richard Lechette, Commercial Litigation; Insurance Law, Personal Injury Litigation – Defendants

Thought Leadership

Pennsylvania Superior Court Reaffirms Liberal Pleading Standard in Medical Malpractice Actions

Legal Roundup: Pennsylvania The Pennsylvania Superior Court has reinforced a broader fact-pleading approach that may make it more difficult for health care defendants to obtain dismissal at the preliminary objection stage. In DaSilva v. Abington Memorial Hospital, the court held that the plaintiffs’ second amended complaint satisfied Pennsylvania’s fact‑pleading requirements despite the absence of individually named negligent actors. In DaSilva, the plaintiffs filed a second amended complaint alleging that Abington Memorial Hospital was directly and vicariously negligent after the patient, who was experiencing a mental health crisis, was left unattended by hospital staff, exited the emergency department, and was struck by a vehicle, suffering serious injuries. The trial court sustained the hospital’s preliminary objections and dismissed the complaint with prejudice, stating plaintiffs “failed to plead any material factual allegations in support of their claims of negligence [and] set forth vague allegations of negligence and unidentified agency.” Id. at *5. The plaintiffs appealed. On appeal, the Superior Court reversed, holding that the complaint sufficiently pled negligence and vicarious liability claims under Pa.R.C.P. 1019(a). The court concluded that allegations describing the patient’s condition, the hospital’s awareness of that condition, and the alleged failure to monitor or prevent elopement were adequate to satisfy Pennsylvania’s pleading requirements. Significantly, the court rejected the hospital’s argument that the complaint failed because it did not identify the specific employees responsible for the alleged negligence. Instead, the court found that generalized references to “emergency room staff” were sufficient to place the hospital on notice of the claims because “the names of those who performed services for the plaintiff are known to the defendant or can be ascertained during discovery.” Id. at *12 (citing Est. of Denmark ex rel. Hurst v. Williams, 117 A.3d 300, 307 (Pa. Super. 2015)). The effect of DaSilva is that plaintiffs may proceed past the pleading stage with relatively generalized allegations, particularly in cases involving institutional defendants where relevant details are uniquely within the defendant’s control. As a result, health care defendants should anticipate that challenges to claim sufficiency may be resolved in the later stages of litigation, including discovery and summary judgment.

Result

No-Cause Jury Verdict Secured in Wrongful Death Trial

We successfully obtained a no-cause jury verdict in a 13-day wrongful death trial. The decedent, a 59-year-old man, was admitted to the emergency room on February 15, 2019, with complaints of abdominal pain, decreased appetite, and constipation, despite the use of laxatives. The patient did not complain of any nausea, vomiting, or diarrhea. He had a significant medical history including diabetes, hypertension, prior coronary artery stenting, morbid obesity (with past gastric bypass surgery), longstanding ventral hernia, and back pain. A CT scan revealed multiple hernias and a potential closed-loop bowel obstruction, leading to a surgery consultation. Our client, an emergency general surgeon, interpreted that the patient did not have a closed loop or any significant obstruction and recommended non-surgical management. The patient was approved to have clear liquids, and had a vomiting incident shortly after, but our client was not notified. The patient was returned to NPO status, and after improving overnight, he was returned to “clears” and additional medical and renal consults were ordered. Our client did not receive any communications from the residents/nurses of any changes in the patient’s condition. On February 18, 2019, two rapid responses were called due to increased heart rate and vomiting. It is believed that the vomiting resulted in aspiration, causing sepsis, ultimately leading to the patient’s death. During the trial, the plaintiff’s sole medical expert highlighted imaging on the wrong hernia, which called into question all of his opinions in the case. We made key objections related to the expert testimony, limiting what the allegations were, and preventing new allegations from being made. After approximately two and a half hours of deliberating, the jury returned a no-cause verdict. 

Thought Leadership

The Ohio Supreme Court Extends Sham-Affidavit Rule to Contradictory Expert Reports

Legal Roundup: Ohio In its June 23, 2026, decision in Moore v. Mercy Medical Center, the Ohio Supreme Court upheld a trial court’s decision to strike an expert witness’s affidavit that contradicted the opinions expressed in the expert’s prior report. This case pertains to allegations of medical malpractice after plaintiff Cheri Moore gave birth to an infant in respiratory distress who required intubation. Moore alleged that a delay in ordering an emergency cesarean section resulted in the need for intubation, causing her child’s injuries. Specifically, Moore sued Dr. Meniru, who completed his first shift at 7:00 a.m. on May 28, 2015, and did not resume treating Moore until 7:00 a.m. on May 29, 2015. One of Moore’s expert witnesses authored a report stating that the doctors, including Dr. Meniru, deviated from the standard of care by not advocating for a cesarean section in the evening of May 28, 2015. Based on this report, Dr. Meniru moved for summary judgment, arguing that the alleged breach occurred during a period when he was not on duty. In response to the summary judgment motion, the plaintiff filed an affidavit from the same expert. Although the expert expressly incorporated his previous report into his affidavit, he also offered an additional opinion: that Dr. Meniru breached the standard of care by failing to begin a cesarean section within 30 minutes of receiving reports of fetal distress. Dr. Meniru filed a motion to strike the expert’s affidavit, arguing that it contradicted the opinions set forth in his prior report in violation of the sham-affidavit rule. The sham-affidavit rule applies to “a contradictory affidavit that indicates only that the affiant cannot maintain a consistent story, or is willing to offer a statement solely for the purpose of defeating summary judgment”. Moore, supra, at ¶ 19, citing Pettiford v. Aggarwal, 126 Ohio St.3d 413, 2010-Ohio-3237. The trial court granted both the motion to strike and the motion for summary judgment, and the Fifth District affirmed. The Ohio Supreme Court accepted two questions of law: (1) whether the sham-affidavit rule applies when the sworn testimony contradicts prior unsworn statements; and (2) whether an inconsistency within the affidavit goes to credibility or admissibility, justifying an order striking the affidavit. Previous rulings by the Ohio Supreme Court regarding the sham-affidavit rule have pertained to contradictions between an affidavit and sworn deposition testimony. See, e.g., Byrd v. Smith, 2006- Ohio-3455, 110 Ohio St.3d 24, 850 N.E.2d 47. However, here, the Court was asked to apply the same rule to contradictions between a sworn affidavit and an unsworn expert report. The Court held that, because Moore’s expert incorporated his prior report into his affidavit, he effectively adopted the report as part of his sworn testimony.