Skip to main content


Not yet reviewed

About me

Seth Lesser is a partner in Klafter Olsen & Lesser, where he primarily represents defrauded consumers, employees and businesses.  He is admitted to the bars of those three jurisdictions, as well as two dozen federal courts (see below).  Mr. Lesser is a graduate of Princeton University, A.B., summa cum laude (1983); Oxford University, D.Phil. in Modern History, recipient of a Marshall Scholarship (1985); and Harvard Law School, J.D., magna cum laude (1988), where he was an editor of the Harvard Journal of International Law and of the Harvard Environmental Law Review.  In addition, he was the Princeton University Varsity Heavyweight coxswain in 1982 & 1983 and the coxswain of the Oxford Blue Boat in the Oxford-Cambridge Boat Race in 1984 & 1985.

 Mr. Lesser has been the lead plaintiffs’ counsel in dozens of successful individual, class and/or collective actions in the areas of securities, employment, privacy and mass tort litigation. The cases in which he has personally been a lead counsel have returned over a half a billion dollars to his clients and the cases in which he has been co-counsel several times that amount.  In addition to many class actions where he was lead plaintiffs’ counsel but which cases were not Federal Multidistrict Litigation proceedings, the MDLs where he has served as lead counsel have including, among others, MDL-1346 (In re Amazon-Alexa); MDL-1352 (In re Doubleclick); MDL-1708 (In re Guidant Implantable Heart Devices); MDL-1739 (In re Grand Theft Auto Video Game Consumer Litigation); MDL-1903 (In re Pepsico, Inc. Bottled Water Sales Practices); and MDL-2025 (In re Staples, Inc. Wage & Hour Employment Practices Litig.).  He has also served on numerous MDL Executive/Steering Committees, including the Executive Committee in MDL-1845 (ConAgra Peanut Butter Products Liability Litigation), and serving as Law & Briefing Co-Chair of the Government Actions Committee in MDL-1657 (Vioxx Products Liability Litigation).

Mr. Lesser was the National Association of Consumer Advocates’ Attorney of the Year in 2005 and was Co-Chair of the Board of Directors of that organization from 2008 through 2013.  From 1998 through 2001, he served as the representative of the American Council on Consumer Interests to the United Nations.  At present, he is on the Second Circuit Courts Committee of the Federal Bar Council, is active in the Members Consultative Groups of the American Law Institute’s Restatement of the Law Third, Restitution and Unjust Enrichment project.   


Photos and videos

704234 1461712857

Practice areas


  1. Litigation: 25%
    27 years, 150 cases
  2. Employment: 20%
    15 years, 40 cases
  3. Consumer Protection: 20%
    20 years, 50 cases
  4. Class Action: 20%
    22 years, 80 cases
  5. Investment Fraud: 15%
    27 years



Contingent (20-35%)

Attorney endorsements

No endorsements

Endorsements from fellow lawyers are an important consideration for many when selecting the right attorney. Be the first to endorse your colleague!

Are you an attorney? Endorse this lawyer

Contact info

Klafter Olsen & Lesser Llp

2 International Dr Ste 350
Rye Brook, NY, 10573-1066


DCActive 199007/10/2016
NYCurrently registered 198903/07/2016
INAdministrative - Not Authorized to PracticeUnknown07/03/2016
We have not found any instances of professional misconduct for this lawyer.
Avvo contributions
Legal answers
Award nameGrantorDate granted
Super LawyerSuperLawyers2015
Super Lawyer 2008-2015SuperLawyers2014
Top 25 Lawyers Westchester AreaSuperLawyers2012
Elected as MemberAmerican Law Institute2008
Attorney of the YearNational Association of Consumer Advocates2005
Work experience
TitleCompany nameDuration
PartnerKlafter Olsen & Lesser LLP2008 - Present
PartnerLocks Law Firm PLLC2003 - 2008
PartnerBernstein Litowitz Berger & Grossmann, LLP1995 - 2003
Association namePosition nameDuration
National Employment Lawyers AssociationMember2006 - Present
Federal Bar Council, Second Circuit Courts CommitteeMember2006 - Present
American Association for JusticeMember2000 - Present
American Bar AssociationMember1990 - Present
National Association of Consumer AdvocatesCo-Chair, Board of Directors2008 - 2013
American Association for JusticeCo-Chair, Food-borne Illness Litigation Group2007 - 2010
National Association of Securities and Consumer Law AttorneysChair, Consumer Committee2003 - 2005
New York City Bar AssociationMember, Committee on Consumer Affairs1995 - 1998
American Bar AssociationCo-Chair, Co-Chair, Business Law Section’s Review of Litigation1995 - 1998
American Bar AssociationChair, Business Section, Environmental Litigation1995 - 2002
Legal cases
Case nameOutcome
In re Guidant Implantable Heart Devices - MDL 1708$240 million
In re Staples, Inc. Wage & Hour Employment Practices Litig.$42 million
Nash v. CVS, 09-cv-079 (D.R.I.)$34 million
See all legal cases 
Publication nameTitleDate
Federal Bar CouncilCourthouses of the Second Circuit (Contributor)2015
National Consumer Law CenterConsumer Class Actions (contributor and editor)2015
THE JOURNAL OF CONSUMER AFFAIRSAn Attorney’s Reaction to Professor Kolodinsky’s Observations2010
INTERNATIONAL JOURNAL OF CONSUMER STUDIESTime price differentials in the rent-to-own industry: implications with empowering vulnerable consumers2005
New York Law JournalAnnual Review of New York's Consumer Protection Statute2005
New Jersey Law JournalNew Jersey’s Consumer Fraud Law2003
Considering Consumer PrivacyInternet Privacy Litigation and the Current Normative Rules of Internet Privacy Protection2003
Internet Law & BusinessPrivacy Law in the Internet Era2002
NEW YORK LAW JOURNALThe Second Circuit Cuts Back on Diversity Jurisdiction1997
School nameMajorDegreeGraduated
Harvard University Law SchoolLawJD - Juris Doctor1988
Oxford UniversityModern HistoryPhD - Doctorate1986
Princeton UniversityHistoryAB1983
Speaking engagements
Conference nameTitleDate
Public Justice WebinarWhat’s Next After Campbell-Ewald?2016
Litigation ConferenceAnnual Symposium on Class Act2015
66th Annual Conference on LaborRegulation of Compensation2013
Rand Institute for Public JusticeConference on Alternative Litigation Finance2010
Practising Law InstituteConsumer Financial Services Litigation2009
Meadowlands SeminarNew Jersey Consumer Fraud Act2009