Warner Bros. Television describes Boardman as a Classics professor at St. Roch University, who has devoted his life to researching the story of Chayara (Hawkgirl) and Prince Khufu (Hawkman) and their link to Vandal Savage. Professor Boardman is our team’s only hope of finding Vandal and destroying him, so they can return home. But when the Legends learn a secret about Boardman, they insist on making him a part of their journey, only to learn the kind of sacrifice it will take to save the world.
The character isn't one we recognize from DC mythology, but St. Roch University is indeed something that has previously existed in Hawkman lore. It sounds a bit like he may be a good way to facilitate the relationship between fellow academic Ray Palmer and Carter Hall, his longtime best friend in the comics.