Maria Costanza Mariani was born in Rome on 16.08.1969 and graduated in law from the University of the Sapienza of Rome in 1993; she has been a lawyer since 1996. She has worked within the Casellato Law Firm of Criminal Attorneys since 1993 and she deals primarily with offenses in matters of malpractice, slander and libel, crimes against the person and their estate, in addition to juvenile crime.

Additionally, she takes care of the distribution of work within the office.