- Son of Rick Duffield, the creator of Wishbone (1995).
- Brother of Becca Duffield.
- He was the Boys Basketball coach for Vista Ridge High School in Cedar Park, Texas from 2010 to 2016. Joe previously worked as a coach at Bryan Adams High School and Lake Highlands High School in Dallas. He is currently a Boys Varsity basketball coach for Lake Highlands High School.
- Joe has three daughters with his wife, Melissa.
- Joe graduated from Santa Clara University in 2002.
- He is a graduate of Plano East Senior High School.
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