Mr. Brennan has practiced law for over forty years, primarily in Maryland and in federal courts. He has been involved at both trial and appellate levels in U.S. District and Circuit Courts in the District of Columbia, Florida, Iowa, Kentucky, Maryland, Massachusetts, New Jersey, New York, Ohio, Puerto Rico, Virginia, and West Virginia. Mr. Brennan has successfully litigated over 30 death penalty cases and he has qualified as an expert witness in death penalty litigation in the State of Maryland.
Other criminal trial work includes major murder cases, white collar crimes, and drug conspiracies involving complex wire-tap issues. Mr. Brennan has served as local counsel for major law firms in civil litigation involving individuals and corporate institutions. He has also participated in corporate internal investigations. Mr. Brennan is well-known in the legal community for his representation of clients before the Maryland Attorney Grievance Commission and the Maryland Commission on Judicial Disabilities.
As a guest lecturer, Mr. Brennan has spoken for the:
- NAACP Legal Defense Fund
- NLADA Life in Balance Death Penalty Conference
- Judicial Educational Conference for the State of Maryland
- Maryland State Bar Association Annual Meeting
- Maryland State’s Attorneys’ Association
- Maryland Public Defenders’ Conference
In 1999, he was the recipient of the John Adams Award for Extraordinary Defense Service awarded by the Federal Defenders of Maryland. In 2006, he was honored with the Robert C. Heeney Memorial Award for Exemplifying the Highest Professional Standards and Achievements by the Section of Criminal Law and Practice of the Maryland State Bar Association.
Mr. Brennan is admitted to practice law in:
- Maryland
- District of Columbia Bars
- U.S. District Courts for Maryland and the District of Columbia
- U.S. Courts of Appeals for the District of Columbia, 1st, 4th, 6th, and Federal circuits
- United States Supreme Court
He is also a member of various legal organizations, including:
- Maryland State Bar Association (Criminal Law Section Council 1984 – 1996; 2000 – present)
- National Association of Criminal Defense Lawyers
- Maryland Criminal Defense Attorneys’ Association (Board of Directors 1999 – present)
Mr. Brennan co-founded the Marlborough Chapter of the American Inns of Court. He is also a member of the Fourth Circuit Judicial Conference.
Mr. Brennan currently serves as Co-chairman of the Character Committee of the Court of Appeals of Maryland for the Fourth Appellate Circuit. In 2010, Mr. Brennan was selected to serve on the United States Sentencing Commission’s Practitioner’s Advisory Group.
He became a fellow of the American College of Trial Lawyers in 2000. In April 2002, Washingtonian magazine named Mr. Brennan as one of the top 75 lawyers in Washington, in an article entitled "Best 75 Lawyers." Mr. Brennan was also listed in the 2006 edition of the Best Lawyers in America and in the 2007 edition of Maryland Super Lawyers®.
The recipient of a number of educational awards, Mr. Brennan graduated magna cum laude and Phi Beta Kappa from Boston College and received his law degree from The Catholic University of America.