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Not much is known about Gaffney except that he was a long-term-sub teacher for Clara Godfrey when she went on sabbatical. Nate once mentioned that he saw him working at Orange Julius.
After Nate Wright and Teddy Ortiz entered the classroom, Mr. Gaffeny reveals himself to be a long-term substitute for Mrs. Godfrey, who is going on sabbatical. Eventually, Nate gives him a nickname, Al G (Amish-Looking Guy).