About Our Attorneys

Aiken and O’Halloran is a criminal defense firm with four convenient offices serving all of southwest Florida. We like to refer to ourselves as a criminal defense team. We pride ourselves on our ability to draw on the unique talents of each individual lawyer and match that attorney to the particular problem at hand.

Peter Aiken, a former forensic accountant, federal agent, federal prosecutor and 30-year veteran trial attorney, contributes to our team effort a level of experience that can be gained only through thousands of cases and hundreds of trials.

Sean O’Halloran, a former state prosecutor in both Charlotte and Lee counties, has honed his trial skills in the state courts. More importantly, he possesses a level of local knowledge gained from years of jury trials before local judges.

Please click on each attorney’s name below to learn more.

Success Through Active Investigation And Careful Preparation

We actively investigate and prepare our defenses often before criminal charges are filed. We thoroughly investigate and research every possible defense. We negotiate when productive, but at the same time have the skills and experience to be formidable adversaries at trial. Appeals, the last resort, are exhaustively researched, briefed and argued.

We encourage you to click on our attorney profiles for details regarding individual experience and expertise. For detailed discussion on particular subjects, simply point and click.

There is never a charge for the first consultation. Call us at any of our four offices to discuss your problem or to schedule an appointment.

Our job is not to judge you; we are here to defend you. Call today for a telephone consultation or to schedule a free consultation at any of our four offices. Contact us today.


I am a fourth generation Floridian. My undergraduate degree is in accounting from the University of South Carolina. After graduation, I served in the United States Treasury Department as a special agent with the Intelligence Divisions. The enforcement training regimen consisted of basic training in Federal Criminal Investigation, which included techniques of interrogation, surveillance, photography, forensics and report writing. Specialized training included investigating and prosecuting Federal Criminal Tax Violations. Formal legal training included a Juris Doctor degree from the University of Miami. After joining the Department of Justice, I served for several years as a trial attorney in the US Attorney’s Office in Miami, Florida handling a wide range of Federal violations including tax prosecutions, drug prosecutions, firearms prosecutions, and other Federal violations. I left the United States Attorney’s Office to join the firm of Cohen and Hogan then located on South Beach. At the time, Cohen and Hogan was one of the best known criminal defense firms in Miami, specializing in complex Federal criminal litigation involving wiretaps, racketeering, and major fraud cases.

In 1974, I moved my practice from Miami, Florida to Ft. Lauderdale, Florida where as a sole practitioner expanded my practice to include State criminal defense. I practiced in Ft. Lauderdale, Florida from 1974 to 2002. During that period of time, I developed one of the largest Federal criminal practices in Broward County and represented people throughout the United States in various Federal venues. Many of these cases were complex multi-defendant conspiracies. My Federal Trial experience includes jury trials in Los Angeles; Salt Lake City; New York City; Cleveland, Ohio; Florence, South Carolina; Georgia; Virginia and North Carolina and handled relating proceedings in other states, including Mississippi; Michigan; Illinois and Massachusetts. My admissions to the Appellate venues include the 11th Circuit Court of Appeals, the 4th Circuit Court of Appeals, the 5th Circuit Court of Appeals, and the 3rd Circuit Court of Appeals, as well as the United States Supreme Court. I am at this time a member of the bar of four (4) states including Florida, Colorado, Wyoming and Montana. In terms of trial experience, I have participated in approximately 200 jury trials encompassing almost every conceivable type of criminal violation, including homicide, drug violations, conspiracy, racketeering, firearms violation, securities violation, wire and mail fraud, wildlife violations, income tax fraud, sales tax fraud, employment tax fraud, high seas violations, explosives violations, embezzlement, theft, counterfeiting and forgery, labor law and racketeering violations, bribery and smuggling. Over the years, my clients have included a congressman, a number of judges, politicians, and people from every walk of life from the clergy to the homeless. As a Federal criminal practitioner, I have also extensively represented witnesses and targets before Federal grand juries and in that capacity, over the years, represented numerous organized crime figures involved in gambling, extortion, prostitution, loan sharking, and racketeering.

In 2002, I expanded my practice to include the Southwest Coast of Florida and formed a partnership with Sean C. O’Halloran, a former State Prosecutor in both Charlotte and Lee County. Mr. O’Halloran is the son of a prominent lawyer and a native Fort Myers resident. The combination of my 30 years of experience and his local knowledge and reputation culminated in the expansion of our practice to Sarasota County and Charlotte County. We now maintain offices in all three counties.

I encourage you to compare my qualifications and experience with any other criminal defense attorney in the State of Florida.  Don’t be fooled by attorneys who tell you what you want to hear.

Litigation Percentage
•100% of Practice Devoted to Litigation

Bar Admissions
•Florida, 1971
•Colorado, 1986
•Montana, 1993
•Wyoming, 1994
•U.S. District Court Middle District of Florida, 1983
•U.S. District Court Southern District of Florida, 1972
•U.S. Court of Appeals 11th Circuit, 1981
•U.S. Court of Appeals 5th Circuit, 1981
•U.S. Court of Appeals 3rd Circuit, 1982
•U.S. Court of Appeals 4th Circuit, 1984
•U.S. Supreme Court, 1975


University of Miami School of Law, Coral Gables, Florida  J.D. – 1971

University of South Carolina, Columbia, South Carolina  B.S. – 1965

Major : Accounting

Professional Associations and Memberships
•AVVO AV | Peer Review Rated for Ethical Standards & Legal Ability | Preeminent
•Florida Association of Criminal Defense Lawyers
•Sarasota County Bar Association

Past Employment Positions
•U.S. Treasury Department / IRS Intelligence, Special Agent, 1965 – 1971
•U.S. Department of Justice, Trial Attorney, 1972 – 1973
•Cohen & Hogan, Miami FL, Trial Attorney, 1974

Contact me today for a free consultation at (941) 366-3506 . All Replies Are Confidential: Comments are to my E-mail only. When you click Post Comment or Reply ,it only goes to my confidential e-mail. I will contact you promptly. Please leave how you want to be contacted and your contact information. Again all information is confidential.

Sean C. O’Halloran

I am a partner and trial attorney with the law firm of Aiken, O’Halloran & Associates. I have lived in Fort Myers since 1973. I graduated high school from Bishop Verot in 1992 and received my undergraduate degree from Florida State University. I graduated from law school in 1999 and was admitted to the Florida Bar in April of 2000.

After being admitted to the Bar, I worked at the State Attorney’s Office prosecuting misdemeanor and felony cases for three (3) years. I handled misdemeanor cases in Charlotte County, including misdemeanor DUI’s, domestic violence batteries, petit thefts, driver’s license offenses and fish and game violations. I tried dozens of cases in Charlotte County and eventually took over the juvenile prosecutor’s position before moving to take on felony matters in Fort Myers.

As a felony prosecutor in Fort Myers, I tried dozens of cases including multiple murder trials, firearm related offenses, drug violations, robberies, and aggravated battery allegations.

After gaining trial experience from the State Attorney’s Office, my partner and I established the law firm of Aiken, O’Halloran & Associates early in 2004. Our law firm represents people charged with all types of State and Federal criminal offenses. We are trial attorneys with the experience to defend people arrested in Collier, Lee and Charlotte Counties.

In addition to our trial experience, our office focuses on thoroughly investigating your cases in an effort to defend you. Regularly, we use and investigator to take statements on our client’s behalf, question witnesses involved in an arrest and collect evidence to support appropriate defenses. Often this results in our office having an opportunity to present our client’s defenses to a Prosecutor prior to a filing decision being made by the State Attorney’s Office. In this way, we are able to resolve many cases without charges being filed, or negotiate a resolution to a reduced charge for a more reasonable sentence.

Bar Admissions

  • Florida, 2000
  • U.S. District Court Middle District of Florida, 2005


  • Florida Coastal School of Law, Jacksonville, Florida
    • J.D.
  • Florida State University, Tallahassee, FL
    • B.A. – 1996
    • Major: Communication Management
    • Major: Business Management

Professional Associations and Memberships

  • Florida Association Criminal Defense Lawyers, Member, 2006 – 2008

Past Employment Positions

  • State Atty. Office, Lee County, Assistant State Attorney, 2000 – 2002
  • State Atty. Office, Charlotte County, Assistant State Attorney, 2002 – 2003