image of Sean Callahan
Sean Callahan
Founder,, Inc.

CSU San Marcos

B.S. Business Administration (2005)
  • A serial entrepreneur, launched TweetPhoto, a real-time photo-sharing platform for use with Twitter and other social media websites, with his partner, Rodney Rumford.
  • The company started with only 5,000 beta users but when A-list celebrities, including Justin Bieber and Britney Spears, began using the site to connect with their fans and upload their photos things really took off and they secured $2.6 million from venture capitalists including Qualcomm.
  • Just incorporated a company called inc and plans to experiment with mobile technologies.
  • Previously founded AddsYou, OBEY Clothing, Self Skateboards and several other internet-based businesses.

Notable CSU Alumni in business & professional services

business & professional services
San Marcos