As a public defender investigator, your primary responsibilities are to assist public defender attorneys and gather evidence for use in criminal and civil trials. You work for clients who cannot afford a private attorney for their case. Your investigative duties include conducting interviews, running background checks, completing undercover surveillance, preparing legal documents, conferring with the attorney, and analyzing evidence. You handle a felony or misdemeanor charge, deliver subpoenas, act as a witness, and appear in a trial as necessary.