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Mark J. O’Brien - Tampa, FL

511 West Bay Street Suite 330 Tampa, FL 33606

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Updated: 05/17/2023

Tampa Criminal Defense Law Firm

Our office remains open, and in response to COVID-19 we have expanded our options for remote consultations and virtual meetings. Please contact our office to discuss what meeting option best fits your situation. Call 813-440-2347.


Attorneys Mark O'Brien and Victoria Hatfield provide tenacious, skilled defense against the full range of criminal charges at the state and federal level. Mark O'Brien has practiced criminal law exclusively since 1998. He began his career as a prosecutor in the Miami-Dade County State Attorney's Office, rising to the level of first-degree and felony life prosecutor. In that position, he tried more than 30 cases to verdict and handled literally thousands of cases...

About Mark J. O’Brien

Practice Areas

  • Criminal Defense

Published Works

  • Are You Committing a Federal Crime by Playing Fantasy Sports?, 2015


Offers Free Initial Consultation

Office Information


511 West Bay Street Suite 330 Tampa, FL 33606

Other Offices

Mark J. O’Brien 121 South Orange Avenue Suite 1500 Orlando, FL 32801 813-440-2347

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