He co-founded the popular mixed martial arts website MMAjunkie.com in 2006 and was its editor in chief until 2018. It is the five-time World MMA Awards "Best Media Source" winner (2008-2011, 2014) and a former content partner of Yahoo! Sports.
Stupp is the former interim president of the Mixed Martial Arts Journalists Association. 
Stupp was the weekly MMA columnist for the Dayton Daily News/Cox Ohio Newspapers from 2007-2011.
He was formerly Creative Services Manager for the Cincinnati Reds before devoting himself full-time to MMA. He is co-author of Tom Browning's Tales from the Reds Dugout (2006, Sports Publishing LLC, ISBN 1-59670-046-7), and author of Opening Day at Great American Ball Park (Sports Publishing LLC, ISBN 1-58261-724-4, 2003).
Stupp graduated from the University of Missouri School of Journalism with honors in 2003.
- Tom Browning and Dann Stupp (2006). Tom Browning's Tales from the Reds Dugout. Sports Publishing LLC. ISBN 1-59670-046-7
- "Dann Stupp, TheAthletic.com". 2019-08-24. Retrieved 2019-08-24.
- "USA Today Acquires Mixed-Martial Arts Site MMAjunkie". 2011-11-15. Archived from the original on 2012-06-24. Retrieved 2012-07-08.
- "USA Today Acquires Mixed-Martial Arts Site MMAjunkie.com". 2011-11-14. Retrieved 2012-07-08.
- "Media members form first official MMA Journalists Association", by Richard Deitsch, SI.com
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