Callahan is literary executor for Ralph Ellison, and was the editor for his posthumously-released novel Juneteenth.
In addition to his work with Ellison, Callahan has written or edited numerous volumes related to African-American literature, with a particular emphasis on 20th century literature.
Some of Callahan's other works include In the African-American Grain: The Pursuit of Voice in 20th Century Black Fiction, Ralph Ellison's Invisible Man: A Casebook, and The Illusions of a Nation: Myth and History in the Novels of F.
Scott Fitzgerald.
Callahan also edited Ellison's short story collection Flying Home and co-edited with Albert Murray the Modern Library edition of Trading Twelves: The Selected Letters of Ralph Ellison and Albert Murray.
As Darryl Pinckney has observed: "Thanks to Callahan, there are more Ellison titles now than existed during his lifetime."In 2010 Callahan published a fuller version of Ellison's unfinished second novel as Three Days Before the Shooting.
Callahan currently serves as the Morgan S.
Odell Professor of Humanities at Lewis & Clark College.
He earned his B.A.
from the University of Connecticut and his M.A.
and Ph.D.
from the University of Illinois.
Callahan is the author of A Man You Could Love, a novel published in 2007 by Fulcrum Publishing.
In 2015, Callahan donated his papers to the Lewis & Clark Archives.