He graduated from the State University of New York at Stony Brook with a Bachelor of Arts degree in 1973 and from Stetson University College of Law with a Juris Doctor in 1977.
Marra served as an attorney in the United States Department of Justice from 1977 to 1980.
President George W. Bush nominated Marra to the United States District Court for the Southern District of Florida on January 23, 2002, to a new seat created by 114 Stat.
On April 7, 2015, Judge Marra dealt with the pedophilia case involving Jeffrey Epstein.
Marra ruled that sex allegations made against Prince Andrew, the British royal, in court papers filed in Florida must be struck from the public record.