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Practice areas


  1. Class Action: 60%
    16 years
  2. Appeals: 20%
    18 years
  3. Litigation: 20%
    18 years

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Contact info

The Law Office of Sean P. Costello, LLC

P.O. Box 660
Sunbury, OH, 43074


GAActive Member in Good Standing 200611/07/2015
We have not found any instances of professional misconduct for this lawyer.
Avvo contributions
Legal answers
Award nameGrantorDate granted
Finalist, Top Corporate CounselColumbus Business First2011
Work experience
TitleCompany nameDuration
Founding MemberThe Law Office of Sean P. Costello, LLC2014 - Present
Managing CounselNationwide Mutual Insurance Company2011 - 2014
Lead CounselNationwide Insurance2009 - 2011
AssociateJones Day1999 - 2009
Law ClerkHonorable K.M. O'Malley, U.S. District Court, Northern District of Ohio1997 - 1999
Association namePosition nameDuration
State Bar of GeorgiaMember2006 - Present
Defense Research InstituteMember2006 - 2009
Case Western Reserve Law Alumni Association BoardMember2006 - Present
Publication nameTitleDate
Legal Strategy ReviewSearching for Clarity2010
Practice PerspectivesBehind the Curtain: Judicial Scrutiny of Differential Diagnosis under Frye and Daubert2009
Drug and Device Law BlogToday's Minnesota Supreme Court Decision In Fleeger -- Minnesota Is Still The Ellis Island For Old, Tired Products Liability Suits ... But Not Forever2009
Metropolitan Corporate CounselPut Your Boots On: Preparing for the Product Crisis2008
Drug and Device Law BlogShocking News from the Seventh Circuit: "Less" Doesn't Mean "More"2008
Georgetown Journal of Legal EthicsRobbing Peter to Pay Paul: The Conflict of Interest Problem in Sibling Class Actions (Sept. 2008)2008
Practice Perspectives: Product Liability and Tort LitigationThe Appeal Bond--What It Is, How It Works, and Why It Needs To Be Factored Into Your Litigation Strategy2008
Drug and Device Law BlogThe FJC's Latest Report on CAFA-The Trends Continue2008
Drug and Device Law BlogCAFA's Revolving Door?2008
Practice Perspectives: Product Liability and Tort LitigationThe Product Crisis: Staying Ahead By Planning Ahead2008
Drug and Device Law Blog ( on the Road to Recovery2008
Drug and Device Law Blog ( the Road to Recovery2007
Drug and Device Law BlogNews Flash: CAFA Is Working2007
Class Action Litigation Report (BNA)Mass Torts That Fizzle: An Autopsy of the Charity Care Litigation2007
Practice Perspectives: Product Liability and Tort LitigationThe Class Action Fairness Act Two Years Later: Looking Back and Looking Ahead2007
Drug and Device Law BlogDoes the Rise of the Consumer Fraud Class Action Mean the Decline of the Learned Intermediary Doctrine? Nah!2007
The Practical LitigatorRule 30(e): What You Don't Know Could Hurt You - Beware the sham errata sheet - or any other errata sheet! 2006
Andrews Toxic Torts Litigation ReporterThe Class Action Fairness Act: Enough Rope to Pull Class-Action Defendants Out of 'Judicial Hellholes' or Just Enough to Hang Them? 2005
Andrews Insurance Litigation ReporterThe Class Action Fairness Act2005
Seton Hall Law ReviewShow Me Your Wares: The Use of Provocative Ads to Attract Clients 1999
Western Reserve Law ReviewStrange Brew: The State of Commercial Speech Jurisprudence Before and After 44 Liquormart, Inc. v. Rhode Island 1997
School nameMajorDegreeGraduated
Case Western Reserve University School of LawLawJD - Juris Doctor1997
Georgia State UniversityFinanceBBA1994
Speaking engagements
Conference nameTitleDate
Ohio State Bar Association Class Action Litigation SeminarArbitration Clauses, Class Action Waivers and Concepcion2011
OACTA Annual MeetingOhio Class Action Developments--Panel2011
CBA Class Action SeminarClass action developments in the Supreme Court2011
ACI Consumer Finance Litigation ConferenceClass Actions and Arbitration: AT&T Mobility v Concepcion2011
ACI Bad Faith Litigation SeminarInsurance bad faith litigation2011
Current Legal Issues Facing the Business CommunityLegal Landscape in the Changed Economy2010
CO-ACC SeminarAlternative Fee Arrangements2010
Industry MeetingClass Actions Across Jurisdictions2005