Mark J. O'Brien

Criminal Defense Lawyer · Mark J. O'Brien, P.A. · Tampa, Florida

Mark J. O'Brien, Criminal Defense attorney in Tampa

Mark J. O'Brien is a criminal defense attorney in Tampa, Florida featured by Haute Lawyer Network. This profile highlights their legal focus, professional background, Attorney Talk features, and contact information.

About Mark J. O'Brien

Mark J. O'Brien, Esquire, is the founder and managing partner of O'Brien Hatfield, PA, a criminal defense law firm based in Tampa, Florida, that focuses on nationwide federal criminal defense and statewide criminal defense and criminal appeals.

Mark has practiced criminal law exclusively since 1998. He began his career as a prosecutor in the Miami-Dade County State Attorney's Office, rising through the ranks before transitioning to defense work. As a former Federal and State Prosecutor, Mark brings invaluable insider knowledge of how the government builds and prosecutes criminal cases.

Mark handles federal criminal cases in federal courts statewide and throughout the United States. He is widely lauded by federal judges and federal prosecutors as one of the best federal defense attorneys in Florida. His practice encompasses white collar criminal defense, federal investigations, healthcare fraud defense, drug trafficking defense, and complex criminal matters at both the state and federal level.

Practice Focus

Mark J. O'Brien concentrates on Criminal Defense and White Collar Criminal Defense.

Professional Background

Mark J. O'Brien practices with Mark J. O'Brien, P.A..

Their professional title is Criminal Defense Lawyer.

Mark J. O'Brien is a verified member of the Haute Lawyer Network, the invitation-based attorney platform operated by Haute Living. Membership requires editorial review by the Haute Living team and inclusion does not constitute a recommendation, endorsement, or guarantee of any specific outcome.

Markets Served

Mark J. O'Brien is based in Tampa, Florida and accepts inquiries from clients in the surrounding region. The exact scope of representation, jurisdiction, and engagement terms are determined directly between the prospective client and the attorney.

Prospective clients are encouraged to confirm jurisdictional eligibility, conflicts of interest, and the availability of representation before relying on any information presented in this profile. Initial consultations, retainer requirements, and fee arrangements vary by matter and are arranged through direct contact with Mark J. O'Brien or Mark J. O'Brien, P.A.. The Haute Lawyer Network does not facilitate, supervise, or guarantee any client engagement.

This profile is part of the curated Haute Lawyer directory, alongside other criminal defense attorneys reviewed by the editorial team at Haute Living. Visitors researching counsel in Tampa, Florida can compare additional verified Haute Lawyer members nearby through the directory and related practice-area pages.

Attorney Talk Features by Mark J. O'Brien

Contact Mark J. O'Brien

Frequently Asked Questions about Mark J. O'Brien

Who is Mark J. O'Brien?

Mark J. O'Brien is Criminal Defense Lawyer with Mark J. O'Brien, P.A. based in Tampa, Florida, and a verified member of the Haute Lawyer Network by Haute Living.

What does Mark J. O'Brien focus on?

Mark J. O'Brien focuses on Criminal Defense and White Collar Criminal Defense.

Where is Mark J. O'Brien based?

Mark J. O'Brien is based in Tampa, Florida.

What law firm is Mark J. O'Brien with?

Mark J. O'Brien practices with Mark J. O'Brien, P.A. in Tampa, Florida.

Is this profile legal advice?

No. This profile is for general informational purposes only and does not constitute legal advice or create an attorney-client relationship.

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