Sunil Gupta, the former superintendent of Tihar Jail, Delhi’s most secure prison, has gained renewed attention following the release of the Netflix series Black Warrant. The show, inspired by his real-life experiences and the book Black Warrant: Confessions of a Tihar Jailer, co-authored with journalist Sunetra Chowdhary, offers an in-depth look into the operations of India’s most infamous prison. Black Warrant, directed by Vikramaditya Motwane, the series starring Zahan Kapoor has ignited discussions about the deep-rooted issues within Indian prisons, such as corruption, gang violence, and lapses in security. Scroll down to know everything about the real-life Tihar Jailer Sunil Kumar Gupta.  All you need to know about Ex-Tihar Jailer Sunil Kumar Gupta 1. Sunil Kumar Gupta left Railways to join Tihar as a Jailer  Gupta’s path to Tihar Jail began in 1981 when he left his stable job at Indian Railways to follow his ambition of joining the police force. Despite his modest background and lack of physical stature—traits not typically associated with prison officers at the time, as depicted in the series—he remained determined …