O'Brien Hatfield, PA is a criminal defense law firm that focuses on nationwide federal criminal defense and statewide criminal defense and criminal appeals.
Attorney Mark J. O'Brien is the firm's founder and managing partner. He handles federal criminal cases in federal criminal courts statewide and in federal criminal courts throughout the United States. Formerly a Miami prosecutor, Mark is now widely lauded by federal judges and federal prosecutors as one of the best federal defense attorneys in the country. Mark is so in demand that his office is often an airplane with a WiFi connection. Despite reaching such great heights, Mark still treats each case with the same enthusiasm and energy as he did his first (even though he has practiced law for over twenty-five years).
Mark J. O’Brien, Esquire is a nationally recognized Federal Criminal Defense Attorney with over 25 years’ experience in criminal courts all throughout the country. After beginning his professional career as a Miami, Florida prosecutor in the late 1990’s, Mr. O’Brien organized his own law firm in 2002 based upon the professional lessons he learned to that point in his life with the goal defending those accused of federal crimes with a mix of old school values and new school ideas.
During first decade in private practice from 2002 to 2012, Mr. O’Brien defended individuals and corporations charged with federal crimes throughout federal criminal courts in Florida. From 2012 to the present, Mr. O’Brien has accepted the defense of clients in federal criminal courts throughout the entire country, in addition to his previously established practice in all federal courts in Florida. Case after case, success after success, in federal court after federal court, all throughout the country, has resulted in a growing legacy. To put it simply, Mr. O’Brien wins and, as a result, he is a lawyer in demand.
- Widener University Delaware School of Law
- J.D. (1998)
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- Siena College
- B.A. (1995)
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- Partner
- O'Brien Hatfield, PA
- - Current
- Prosecutor
- Miami Dade State Attorney's Office Felony Division
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- Strategies For Defending Identity Theft Cases
- Aspatore
- Criminal Trial Advocacy, Intensive Trial Advocacy Program
- Top 100 Trial Lawyers
- National Trial Lawyers
- Top 40 Under 40
- The National Trial Lawyers
- Super Lawyer
- Super Lawyers
- 2016-2024
- Florida State Bar # 160210
- Member
- - Current
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- Florida
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- Massachusetts
- Massachusetts Board of Bar Overseers
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- Montana
- State Bar of Montana
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- 1st Circuit
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- 2nd Circuit
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- 6th Circuit
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- 11th Circuit
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- U.S. Supreme Court
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- Free Consultation
- Credit Cards Accepted
- Criminal Law
- Criminal Appeals, Drug Crimes, Expungement, Fraud, Gun Crimes, Internet Crimes, Sex Crimes, Theft, Violent Crimes
- White Collar Crime
- English
- Mandarin
- Spanish