John Crivalle's professional life began far from the high-stakes environment of criminal investigations. Growing up on Chicago's Southwest Side, he worked construction jobs while finishing school, absorbing the discipline and patience those early years required. That background, rooted in practical problem-solving, would later inform the methodical style he brought to felony investigations.
Today, Crivalle serves as an Investigator III in the Cook County Public Defender's Office, a senior position that places him at the centre of complex criminal cases. In a county where more than 25,000 felony cases are filed each year, investigators like Crivalle sift through evidence, locate witnesses, and test competing narratives under the scrutiny of both prosecutors and defense attorneys. It is meticulous work that demands accuracy and discretion. "When someone's liberty is on the line, every fact matters," Crivalle says. "You have to be sure what you bring to the courtroom can stand up to the toughest cross-examination."
