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About me

John “Jack” Larkin focuses his practice on litigation and appeals.   Before coming to Gawthrop Greenwood, he practiced as an Assistant District Attorney in the Appeals Division of the Montgomery County District Attorney’s Office, where he argued regularly in front of the Pennsylvania Court of Common Pleas and Superior Court. 

Jack is a graduate of Villanova Law School.  While there he received the Pennsylvania Environmental Law Forum scholarship and was a Dean’s Merit Scholar.  He has also received the Philadelphia Trial Lawyers’ Association’s James J. Mandarino Award for Excellence in Trial Advocacy.

Jack’s published works have appeared in law journals at the Georgetown University School of Law, the University of Florida Law School, and the American Journal of Trial Advocacy, as well as in the Pennsylvania Bar Association’s At Issue publication.  His most recent article appeared in the Vanderbilt Journal of Entertainment and Technology Law, and analyzes the compelled production of encrypted data.  Jack is the founder and editor of a daily blog reporting on developments in Pennsylvania law located at


Practice areas


  1. Litigation: 100%
    8 years, 50 cases



Free consultation (60 minutes)

Attorney endorsements

3 total 

Are you an attorney? Endorse this lawyer

  • Nicholas James Reifsnyder

    I worked with Jack as an assistant district attorney in Montgomery County. I found him to be compelling, intelligent, and well prepared. I would highly recommend Jack Larkin for any legal work.


    Nicholas Reifsnyder Criminal defense Attorney
    Relationship: Co-worker

  • Henry S. Hilles, III

    I endorse this lawyer. I was opposing counsel on several cases when Jack was in the Montgomery County District Attorney's Office. He was always well prepared and represented the Commonwealth zealously and effectively. He is well liked and respected by his fellow lawyers and by judges as well. I would enthusiastically recommend Jack to anyone.


    Henry S. Hilles, III DUI and DWI Attorney
    Relationship: Opposing Counsel on matter

Contact info

Gawthrop Greenwood, PC

17 E. Gay Street
Suite 100
West Chester, PA, 19381-0562


We have not found any instances of professional misconduct for this lawyer.
Avvo contributions
Legal answers
Award nameGrantorDate granted
Rising StarSuper Lawyers2015
Top LawyerMain Line Today2015
Rising StarSuper Lawyers2014
Top LawyerMain Line Today2014
James J. Manderino Award for Excellence in Trial Advocacy.Philadelphia Trial Lawyers Association2009
Dean's Merit ScholarshipVillanova University School of Law2006
Work experience
TitleCompany nameDuration
AssociateGawthrop Greenwood, PC2012 - Present
Assistant District Attorney (Appellate Division)Montgomery County District Attorney's Office2009 - 2012
Association namePosition nameDuration
Red Cross of South Eastern PennsylvaniaLeadership Council Member2013 - Present
Chester County Bar AssociationMember2012 - Present
Montgomery County Bar Association, Alternative Dispute Resolution SectionMember2010 - Present
Legal cases
Case nameOutcome
Commonwealth v. DiPanfiloVictory
Commonwealth v. Stein, 2012 Pa. Super. 26Victory
Commonwealth v. Benson, 2010 PA Super 234Victory
See all legal cases 
Publication nameTitleDate
Pennsylvania Bar QuarterlyGuns in Government Parks & Buildings2015
14 Vanderbilt J. Entm’t & Tech. L. 253 (2012)Compelled Production of Encrypted Data2012
The American Journal of Trial AdvocacyA Proposed Framework for Evaluating Effectiveness of Counsel under Padilla v. Kentucky2011
Journal of Technology Law & Policy (University of Florida)Criminal & Civil Liability For User Generated Content: Craigslist, A Case Study2010
At IssueHow Young Lawyers can Excel at eDiscovery2010
Georgetown International Environmental Law ReviewUNCLOS and the Balance of Environmental and Economic Resources in the Arctic2010
School nameMajorDegreeGraduated
Villanova University School of LawN/AJD - Juris Doctor2009
Oberlin CollegePoliticsBA - Bachelor of Arts2004
Speaking engagements
Conference nameTitleDate
Written Business Communications LectureEffective Writing2013