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About me

Lauded by the Delaware County Daily Times for his “great intelligence, skill, courage and - most importantly – integrity.” 


Delaware County Daily Times, September 28, 2010.      


Practice areas


  1. Employment: 25%
  2. Medical Malpractice: 20%
  3. Litigation: 20%
  4. Commercial Real Estate: 15%
  5. Other: 20%
  6. More 


Payment types:

Cash, Check, Credit card

Attorney endorsements

3 total 

Are you an attorney? Endorse this lawyer

  • Arik Tzvi Ben-Ari

    Mark has an impeccable reputation for getting results for his clients and is well regarded by the legal community for his skills and abilities both in and out of the courtroom.


    Arik Ben-Ari DUI and DWI Attorney
    Relationship: Fellow lawyer in community

  • Christian K. Lassen II

    Well respected in the legal community.


    Christian Lassen Personal injury Attorney
    Relationship: Fellow lawyer in community

Contact info

DiOrio & Sereni, LLP

21 West Front Street
(Corner of Front and Plum Streets)
Media, PA, 19063


We have not found any instances of professional misconduct for this lawyer.
Avvo contributions
Legal answers
Award nameGrantorDate granted
Best Lawyer in the field of trial work, tied for 1st placeDelaware County Daily Times' Reader's Choice2016
Super LawyerPhiladelphia Magazine2015
Super LawyerPhiladelphia Magazine2014
AV Peer Review Rating - PreeminentMartindale-Hubbell2013
Super LawyerPhiladelphia Magazine2013
Super LawyerPhiladelphia Magazine2012
Top LawyerMain Line Today Magazine2012
Awesome AttorneySuburban Life Magazine2011
Top LawyerMain Line Today Magazine2011
Super LawyerPhiladelphia Magazine2011
Awesome AttorneySuburban Life Magazine2010
Super LawyerPhiladelphia Magazine2010
Top 2008 Verdicts/SettlementsLegal Intelligencer2009
Super LawyerPhiladelphia Magazine2009
Top LawyerMain Line Today Magazine2009
Super LawyerPhiladelphia Magazine2008
Super LawyerPhiladephia Magazine2007
Super LawyerPhiladelphia Magazine2006
Super LawyerPhiladelphia Magazine2005
Work experience
TitleCompany nameDuration
Jury ConsultantJury-Focused - jury focus groups and mock trials2004 - Present
PartnerDiOrio & Sereni, LLP1997 - Present
Association namePosition nameDuration
Justinian Society of Delaware CountyMember2014 - Present
Concord TownwatchSolicitor2013 - Present
Concord Township Public Safety Advisory CommitteeMember2010 - Present
National Employment Lawyers AssociationMember2010 - Present
Delaware County School DistrictsSpecial CounselN/A
Pennsylvania School Boards AssociationMemberN/A
National School Boards Association, Council of School AttorneysMemberN/A
Marple Newtown School DistrictSolicitorN/A
Springfield School DistrictSolicitorN/A
The Eastern Pennsylvania Chapter of the National Employment Lawyers AssociationMemberN/A
American Association for JusticeMemberN/A
Delaware County Trial Lawyers AssociationPresidentN/A
American Bar AssociationMemberN/A
Pennsylvania Bar AssociationMemberN/A
Delaware County Bar AssociationMemberN/A
Pennsylvania Association For JusticeMemberN/A
Pennsylvania Trial Lawyers AssociationMemberN/A
Guy G. DeFuria American Inn of CourtMemberN/A
Legal cases
Case nameOutcome
Court Upholds Public School District Protection of Taxpayer Funds and Integrity of Competitive Bid SystemSuccessful Trial Court Decision
Third Circuit Court Of Appeals Upholds Public School District’s Ability to Protect the Rights Of Its Kindergarten StudentsSuccessful Third Circuit Court of Appeals Decision
See all legal cases 
Publication nameTitleDate
Pittsburgh Post GazetteWho gets to decide who doesn't have to pay taxes?2015
Suburban Life MagazineCommitted, Connected, Respected2014
Delaware County Daily TimesThe Final Word2010
School nameMajorDegreeGraduated
National Institute for Trial Advocacy - IntensiveN/ADiplomate1987
University of Pennsylvania Law SchoolN/AJD - Juris Doctor1987
Saint Joseph's UniversityBusiness ManagementOther - Bachelors1984