Preliminary Fire-Causation Opinions Must Satisfy Rule 702; Negligent-Repair Claims Require a Supported Causal Link

1. Introduction

This appeal concerns the intersection of expert-evidence admissibility and proof of causation in a residential fire case. Doshynko Sullivan alleged that his landlord, FP Glenwood, LLC, and property manager, Faros Property Management LLC, negligently maintained and repaired a bedroom light fixture, causing a fire in his apartment.

The central evidentiary question was whether a responding fire chief’s preliminary assessment could support expert testimony about the fire’s cause. The related substantive question was whether Sullivan’s remaining evidence permitted a reasonable jury to connect the defendants’ maintenance work to the fire.

The Eleventh Circuit affirmed both the exclusion of the chief’s causation testimony and summary judgment for the defendants. The decision illustrates two distinct requirements: a proposed expert opinion must rest on a reliable methodology, and a negligence claim must have a supported causal connection between identified wrongdoing and the resulting harm.

2. Background and Procedural History

Sullivan submitted two work orders over approximately one week concerning his bedroom light fixture. He initially reported that the fixture tripped the apartment’s electricity and later reported that it stopped working. The fixture was replaced about a month after the second complaint. Although Sullivan observed occasional flickering afterward, he made no further complaints about the light.

A little more than a month after the replacement, a fire occurred while Sullivan was away from the apartment. He attributed the fire to an improper repair of the fixture.

The two fire assessments

Battalion Chief Winfred Smith, the incident commander, observed charring patterns and initially believed that an electrical fire had begun near the light fixture. He recorded his assessment in a National Fire Incident Reporting System, or NFIRS, report.

Chief Smith nevertheless described his findings as preliminary. His role was to determine whether further investigation by experts was necessary, not to undertake a complete fire-origin investigation. He acknowledged that he had not used the scientific method, followed National Fire Protection Association protocols, conducted experiments, examined the circuit breakers, or evaluated the electrical panel. He also could not exclude other potential causes, including electrical components within the apartment or a power-supply defect.

Fire investigator Corey Smith separately examined the fire. He interviewed people at the scene, took photographs, reviewed burn patterns, and employed the scientific method. His investigation did not establish a cause. He could not exclude electrical components, a power surge, or a circuit-breaker problem to a reasonable degree of certainty.

The district court’s ruling

Sullivan sued approximately two years later. In opposing summary judgment, he relied on Chief Smith’s proposed causation testimony. The district court excluded that testimony as unreliable and entered summary judgment for both defendants. Sullivan appealed both rulings.

3. Summary of the Opinion

The Eleventh Circuit upheld the district court on two principal grounds:

1. Expert admissibility: The district court acted within its discretion in finding Chief Smith’s methodology unreliable. His limited visual assessment did not systematically investigate potential causes, examine important electrical evidence, or eliminate reasonable alternatives. His official position, report, and statement of “engineering certainty” did not cure those deficiencies.
2. Causation: Sullivan’s remaining evidence established a history of fixture problems, replacement work, a later fire, and nearby charring. It did not identify what was negligent about the maintenance or explain how that negligence caused the fire.

The court also affirmed judgment on Sullivan’s nuisance, negligent-supervision, vicarious-liability, and attorney’s-fees claims. Those claims either lacked necessary proof of their own or depended on an underlying claim that could not survive.

4. Analysis

A. Precedents Cited and Their Influence

Appellate review and expert-evidence gatekeeping

United States v. Frazier, 387 F.3d 1244 (11th Cir. 2004)

This decision supplied both the deferential standard for reviewing expert-evidence rulings and the governing three-part admissibility framework: qualification, reliable methodology, and usefulness to the factfinder. Under its “very limited” review, the appellate court would intervene if the district court used the wrong legal standard or reached a manifestly erroneous decision.

It also supported the district court’s gatekeeping responsibility. Because expert evidence can be powerful and misleading, methodological shortcomings may require exclusion rather than simply cross-examination. The disputed requirement here was reliability, not Chief Smith’s qualifications.

McCreight v. AuburnBank, 117 F.4th 1322 (11th Cir. 2024)

This case supplied the summary-judgment standard and de novo appellate review. The court independently considered whether a genuine dispute of material fact existed, viewing the evidence and reasonable inferences favorably to Sullivan. The crucial question was whether a reasonable jury could find for him, not merely whether his theory was conceivable.

Daubert v. Merrell Dow Pharmaceuticals, Inc., 509 U.S. 579 (1993)

Daubert provided the foundational reliability inquiry under Federal Rule of Evidence 702. Relevant considerations include testability, peer review and publication, measurable error rates, and the standing of the methods used. The opinion treated these considerations as applicable “to the extent practicable,” rather than as an inflexible checklist.

The court also invoked Daubert to reject Sullivan’s contention that the investigative gaps concerned only the weight of the testimony. Reliability must first meet an admissibility threshold; jurors need not receive every opinion offered under an expert label.

United States v. Santiago, 202 F. App’x 399 (11th Cir. 2006) (unpublished)

Sullivan cited this decision to support the admissibility of Chief Smith’s approach. The court found it distinguishable: the expert there systematically examined the scene, used the scientific method, and ruled out alternative causes. Those features were absent from Chief Smith’s preliminary assessment. The unpublished decision therefore illustrated a methodological contrast rather than compelling admission.

Great Northern Insurance Co. v. Ruiz, 688 F. Supp. 2d 1362 (S.D. Ga. 2010)

This district court decision likewise did not support Sullivan’s position. The admitted fire-causation opinion involved, among other steps, a process of elimination. Chief Smith had not undertaken a comparable evaluation of alternative explanations. The court’s distinction emphasized the investigation actually performed, not merely the investigator’s status or experience.

Kumho Tire Co. v. Carmichael, 526 U.S. 137 (1999)

This authority recognized that extensive specialized experience can sometimes support conclusions drawn from observations. The Eleventh Circuit did not reject experience-based testimony categorically. Instead, it concluded that this principle did not overcome the substantial gaps Chief Smith himself acknowledged. Experience does not automatically establish the reliability of every inference an experienced witness draws.

Negligence, causation, and summary judgment

Johnson v. Am. Nat'l Red Cross, 276 Ga. 270 (2003)

This case supplied Georgia’s four negligence elements: duty, breach, causation, and damages. It framed the substantive inquiry and made clear that evidence of a maintenance relationship or a damaging fire could not substitute for proof of causation.

Celotex Corp. v. Catrett, 477 U.S. 317 (1986)

Celotex established the consequence of an evidentiary failure on an essential element: summary judgment is appropriate when the party bearing the burden lacks sufficient supporting evidence. Sullivan’s inability to establish a genuine dispute over causation was therefore independently fatal, without requiring resolution of every other negligence element.

Redmon v. Daniel, 335 Ga. App. 159 (2015)

This decision supported the requirement to explain how the defendant’s wrongdoing produced the plaintiff’s harm. The missing link in Sullivan’s case was not simply the fire’s precise ignition mechanism; it was evidence connecting some negligent maintenance act to the fire.

Holcomb Invs. Ltd. v. Keith Hardware, Inc., 354 Ga. App. 270 (2020)

The court cited this decision both for its collection of fire cases involving undetermined causes and to address Sullivan’s reliance on its result. In Holcomb, the claim concerned the allegedly negligent storage of combustible toxic chemicals in a warehouse. Even without identifying the particular materials that combusted, a jury could find that the materials should not have been stored there at all.

Sullivan’s theory differed. He did not argue that placing a light fixture in an apartment was itself negligent; he argued that the defendants maintained it negligently. How the work was performed therefore mattered. Holcomb did not eliminate the need for evidence connecting the allegedly improper repair to the fire.

Avery v. Cleveland Ave. Motel, Inc., 239 Ga. App. 644 (1999)

This case supplied the distinction between possibility and legally sufficient causation evidence. Sullivan needed evidence affording a reasonable basis for a jury to conclude that the defendants’ conduct more likely than not caused the fire. The absence of affirmative proof disproving his theory was not enough.

Related claims and the underlying district court decision

Alexander v. Hulsey Env't Servs., Inc., 306 Ga. App. 459 (2010)

This authority established that nuisance also requires causation. Relabeling the dispute as nuisance did not overcome the missing connection between the defendants’ conduct and the fire.

Leo v. Waffle House, Inc., 298 Ga. App. 838 (2009)

The court relied on this decision in describing negligent supervision as requiring a pattern of underlying employee wrongdoing that the employer failed reasonably to prevent or address. Sullivan identified neither a wrongful act nor a pattern, so this theory failed as well.

Edwards v. Lennar Georgia, LLC, 933 S.E.2d 95 (Ga. Ct. App. 2026)

This decision supported the derivative nature of respondeat superior liability. Without a viable underlying claim, Sullivan could not preserve his vicarious-liability theory against the defendants.

Popham v. Landmark Am. Ins. Co., 340 Ga. App. 603 (2017)

This case supported rejection of the attorney’s-fees claim once Sullivan’s underlying claims failed. The fee request did not independently sustain the lawsuit.

Sullivan v. FP Glenwood, LLC, No. 1:24-CV-1439-MHC, 2026 WL 1105013 (N.D. Ga. Mar. 9, 2026)

This was the decision under review, not an independent appellate precedent. The Eleventh Circuit endorsed its central assessment: fixture problems, replacement, a later fire, and nearby charring did not establish what maintenance was negligent or how it caused the fire.

B. Legal Reasoning

1. Reliability depends on the investigation, not the witness’s title

The court separated Chief Smith’s operational role from the evidentiary purpose for which Sullivan offered his opinion. A preliminary assessment may adequately serve an incident commander’s responsibility to decide whether further investigation is needed. That does not necessarily make it a reliable expert determination of causation.

The acknowledged omissions were central: no systematic testing of the hypothesis, no examination of relevant electrical systems, and no exclusion of plausible alternatives. The court did not criticize Chief Smith for failing to perform work outside his assigned role. It held that the limited work he performed did not require the district court to admit the broader causation opinion Sullivan sought to present.

Similarly, the NFIRS report, sworn testimony, and phrase “reasonable degree of engineering certainty” did not supply a missing methodological foundation. Such labels describe how an opinion is presented; they do not establish how reliably it was reached.

2. The holding is contextual, not a universal fire-investigation checklist

The opinion does not establish that every fire investigator must conduct experiments, follow an identical protocol, or eliminate every conceivable cause. Its reliance on Kumho Tire Co. v. Carmichael preserves the possibility of reliable experience-based opinions. The decisive point was the combination of substantial omissions and Chief Smith’s own description of his investigation as limited.

Nor could Sullivan avoid the reliability inquiry by describing the testimony as concerning fire “origin” rather than fire “cause.” The court treated both as opinions requiring an adequate foundation. Identifying a likely area of origin did not, by itself, establish that negligent repair caused ignition.

3. Sequence and proximity did not establish negligent causation

Sullivan’s evidence made his suspicion understandable: electrical trouble preceded replacement, flickering continued, and a fire later left charring near the fixture. But the legal theory required more than that sequence. A reasonable jury needed evidence identifying a negligent feature of the work and linking it to the fire.

The court did not require Sullivan to prove his case conclusively at summary judgment. It required evidence from which a jury could reasonably find causation more likely than not. Conversely, the defendants did not have to prove a different cause simply because Sullivan’s proposed explanation had not been affirmatively disproved.

The exclusion ruling concerned Chief Smith’s expert causation testimony; the appellate discussion still considered the reported charring and other circumstances. The decision therefore should not be read as declaring that every observation or entry in the NFIRS report was excluded.

4. Federal evidence rules and Georgia substantive law performed different tasks

Federal Rule of Evidence 702 determined whether the proposed expert opinion could be considered. Georgia law determined the elements Sullivan had to support. Federal summary-judgment principles then governed whether the admissible record permitted a trial.

This sequence explains why the evidentiary ruling was consequential without making expert testimony categorically mandatory in every fire case. After the exclusion, the remaining evidence was insufficient here; the court did not announce that circumstantial evidence can never establish fire causation.

C. Potential Impact

• For fire-loss litigation: Parties should distinguish preliminary emergency-response assessments from investigations intended to support litigation opinions. The proposed expert’s actual methods will matter more than an official title or report format.
• For expert disclosures and challenges: Identifying the evidence examined, alternative causes considered, and reasoning connecting observations to conclusions will be important. Expressions of certainty cannot replace that explanation.
• For negligent-repair claims: Prior malfunction and later damage do not automatically establish faulty workmanship. Claimants need a supported connection between the alleged repair defect and the injury.
• For related theories: Nuisance, negligent supervision, and derivative claims cannot necessarily survive the evidentiary deficiency that defeats the central negligence theory.
• For future courts: The unpublished opinion offers persuasive, fact-specific guidance. Its abuse-of-discretion holding means the district court permissibly excluded this testimony, not that all preliminary fire assessments must invariably be excluded.

5. Complex Concepts Simplified

Rule 702 gatekeeping

The judge checks whether expert testimony has a sufficiently reliable foundation before allowing a jury to hear it.

Admissibility versus weight

Admissibility asks whether evidence may be considered at all. Weight asks how persuasive admitted evidence is. Serious methodological gaps can prevent admission rather than merely weaken persuasiveness.

Abuse of discretion

A deferential appellate standard: the reviewing court does not replace a permissible expert-evidence ruling merely because it might have decided differently.

De novo review

The appellate court independently applies the governing legal standard. It used this approach to review summary judgment.

Genuine dispute of material fact

A disagreement supported by enough evidence for a reasonable jury to resolve an outcome-relevant issue in the nonmoving party’s favor. Speculation alone does not qualify.

Fire origin versus fire cause

Origin concerns where a fire began; cause concerns what started it. An opinion locating the fire near a fixture does not necessarily establish that a negligent repair caused it.

Derivative liability

Liability that depends on an underlying wrong. Respondeat superior, for example, can attribute an employee’s actionable conduct to an employer, but does not supply the missing underlying wrongdoing.

6. Conclusion

The Eleventh Circuit affirmed because the proposed expert opinion lacked a sufficiently reliable investigative foundation and the remaining evidence did not reasonably connect negligent maintenance to the fire.

The opinion’s broader significance is its insistence on two separate links: a reliable method connecting observations to an expert conclusion, and sufficient evidence connecting a defendant’s wrongdoing to the plaintiff’s loss. Preliminary impressions, official documentation, and chronological suspicion did not supply those links in this case.