David Callahan is Co-CEO of UltraSignup, the leading race registration platform for trail and ultra running in the U.S., representing more than 80% of the market. Based in Nashville, he co-leads the company, focusing his time and energy on strategy, partnerships, and growth, both of the platform and the sport more broadly.
Switchback Spring, May 22-24, 2027 in New Orleans, LA
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Switchback at TRE, December 1-3, 2026 in San Antonio, TX