Bill Tench is a fictional character from the Netflix series Mindhunter. He works as an FBI agent in the Behavioral Science Unit during the late 1970s. His role involves interviewing serial killers to understand their psychology and help solve ongoing cases. In the series, Bill is portrayed as a dedicated professional who balances his work with family life. He often faces moral dilemmas and the emotional toll of his job, which adds depth to his character. His interactions with other agents, including Holden Ford and Wendy Carr, highlight the challenges of pioneering criminal psychology.