It is established canonically that Harvey knows Bruce Wayne is Batman. The character's knowledge of Batman's secret identity was introduced in the story The Big Burn from Peter Tomasi's 2011 Batman and Robin ongoing series,[38][42] and is shown in subsequent comics such as Scott Snyder's All-Star Batman.[42] In Detective Comics #1021, Harvey admits to Batman that he has been keeping his identity secret from his Two-Face personality in order to protect him.[3]