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Mark S O'Connor

Mark S O'Connor

Practice areas:

Personal Injury, Wrongful Death, Medical Malpractice

About Me

In July 2002, Mark undertook the pro bono representation of victims and families of the September 11, 2001 terrorist attacks to the Victim’s Compensation Fund. He is currently listed in the 2013 edition of “The Best Lawyers in America,” and the 2013 edition of “Southwest Super Lawyers.” In September 2014, Mark was elected by his peers as a Fellow of the International Society of Barristers.


Photos and Videos

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Practice Areas

Licensed since 1986

  1. Personal Injury: 40%
  2. Medical Malpractice: 30%
  3. Wrongful Death: 30%



Free Consultation (30 minutes)

Payment Types:

Cash, Check, Credit Card

Attorney Endorsements

3 total 

  • Lori V Berke

    Mark is the best of the best. I have been on the same side as him as well as opposing counsel. He always displays the utmost professionalism while at the same time being a zealous advocate for his clients. He works tirelessly in representing his clients and leaves no stone unturned. If I needed a personal injury attorney, I would hire Mark.


    Lori Berke Government Attorney
    Relationship: Worked together on matter

  • Gerardo Ivan Hannel

    Mark O'Connor is a genuine trial lawyer, and he takes cases others might turn aside. He takes the time to listen to clients and hear their story. He has a complete knowledge of the underlying law in Arizona, state and federal, and won't let opposing counsel hinder justice. I strongly endorse Marc as a top trial lawyer in Arizona.


    Gerardo Hannel Litigation Attorney
    Relationship: Worked together on matter

Contact Info

Gallagher & Kennedy, P.A.

2575 E. Camelback Road
Suite 1100
Phoenix, AZ, 85016



AZActive 198607/14/2015

Professional Misconduct

We have not found any instances of professional misconduct for this lawyer.

Avvo Contributions

Legal Answers


Award NameGrantorDate Granted
Super LawyerSouthwest Super Lawyers2014
AV Preeminent 5.0 out of 5 Peer Review RatedMartindale-Hubbell2014
Best Lawyers in AmericaBest Lawyers2014
Arizona Finest lawyersArizona Finest Lawyers2014
Top 100 Trial LawyersThe National Trial Lawyers2014

Work Experience

TitleCompany NameDuration
PartnerGallagher & Kennedy, PA2009 - Present


Association NamePosition NameDuration
Arizona Association for JusticeBoard of Directors2013 - Present
Maricopa County Bar AssociationMember1986 - Present
State Bar of ArizonaMember1986 - Present
American Association for JusticeMemberN/A


School NameMajorDegreeGraduated
John Marshall Law School, ChicagoLawJD - Juris DoctorN/A
State Bar of ArizonaPersonal Injury/Wrongful DeathCertified SpecialistN/A

Speaking Engagements

Conference NameTitleDate
Truck Litigation from Start of Finish in Arizona and Keys to Effective Expert Witness Examination in ArizonaTruck Litigation, SpeakerN/A
State Bar of Arizona CLEContinuing Legal Education By the Sea, PanelistN/A
State Bar of Arizona CLEThe State Bar of Arizona Professionalism CourseN/A
National Association of Legal AssistantsHealthcare Communication and Medical Malpractice, SpeakerN/A
Arizona Trial Lawyers AssociationArizona’s Top Ten-How They Did It, PanelistN/A
Arizona State Bar's Courtroom Evidence SeminarCourtroom Evidence, SpeakerN/A