Atty. John C. Sullivan
John C. Sullivan is Of Counsel at London Fischer, LLP and an insurance coverage and complex commercial litigator who advises and defends insurers and policyholders in high-exposure matters.
Profile Summary
About John C. Sullivan at a glance
John C. Sullivan is an Of Counsel based in New York, New York, practicing at London Fischer LLP. Educated at Brooklyn Law School, JD, 2017 (—). Serands clients in New York, NY and the surrounding metropolitan area.
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About
- John C. Sullivan is Of Counsel at London Fischer, LLP and an insurance coverage and complex commercial litigator who advises and defends insurers and policyholders in high-exposure matters
- He focuses his practice on Directors & Officers (D&O), Professional Liability (including E&O), Commercial Crime, and Representations & Warranties (R&W) insurance disputes, with particular depth in R&W matters arising from M&A transactions across a range of industries
- John has substantial experience across the litigation lifecycle-from early case assessment and strategy through pleadings, discovery, depositions, motion practice, and trial support
- In the R&W space, he counsels insurers on coverage positions from initial claim intake through resolution, including matters involving alleged breaches of financial, operational, and compliance representations in acquisition agreements
- He has practiced extensively in New York, including trial in the New York Commercial Division, and appellate advocacy before the New York Appellate Division, First Department
- Before joining London Fischer, John practiced insurance coverage litigation at several firms where he defended and advised insurers in complex D&O, professional liability, and R&W matters and provided frequent coverage counseling
- John is known for delivering practical, business-minded coverage guidance grounded in litigation realities
- He routinely manages a high volume of active matters simultaneously and drafts coverage opinions and key coverage correspondence-including reservations of rights and disclaimers-on a near-daily basis
- He also works closely with claims professionals and stakeholders to align coverage positions, litigation strategy, and business objectives, and he supervises junior attorneys while managing eDiscovery and vendor workflows to promote efficient, cost-effective outcomes
- Notable Decisions / Representative Matters • Represented an insurer in an R&W coverage dispute stemming from a DOJ antitrust investigation involving a large independent physicians' association. • Represented an insurer in an R&W coverage dispute arising out of alleged breaches of financial and operational representations in connection with the acquisition of a U.S. property and casualty insurer. • Represented an insurer in a commercial crime coverage dispute arising from a complex fraud perpetrated on an international financial services firm. • Advised a carrier on financial institution policy coverage for claims involving lending/servicing conduct and supported related litigation posture
Jurisdictional Context
Why local counsel matters in New York
Practicing law in New York. Legal matters in New York are governed by state-specific rules of civil and criminal procedure, statutes of limitations, and substantive law. Cases originating in New York are typically filed in the local municipal court or the appropriate New York state district court, depending on subject matter and amount in controversy. An attorney licensed in New York brings working knowledge of local procedural deadlines, judicial practices in this andnue, and the substantive law that applies to cases brought here. Out-of-state attorneys generally cannot represent clients in New York courts without local counsel or pro hac vice admission.
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