James Haggerty was a Man of letters.
James was a scholarly man of letters. Along with Peter Jenkins, he powered up the Men of Letters Bunker. He was well-versed with several creatures and dimensions. Also with Jenkins, he was one of two men of letters who Dorothy sought assistance from. However, during their meeting, the Wicked Witch escaped and placed Peter Jenkins under her control. Dorothy, followed by the Wicked Witch, ran up to the lab while Peter attacked James. In the ensuing fight, James stabbed Peter with his own knife, freeing his fellow man of letters from control but also killing him in the process.
At some point before his death, he also compiled a thesis titled On the Inner Workings of Angels, indicating he had vast and deep knowledge on celestials, despite the angels not revealing themselves until the 21st century.