Square co-founder Tristan O?Tierney has left the company to travel the world. O?Tierney co-founded Square with Twitter co-founder Jack Dorsey in 2009. O?Tierney graduated from the Rochester Institute of Technology in 2008 with a computer science degree.
O?Tierney previously worked as a Mac Engineer at Yahoo!, Apple, and VMware. He also built the official Obama iPhone app in 2008 and created one of the first Twitter client apps on the Apple App Store called Twinkle. He created that app while working at video game developer company Tapulous, according to VentureBeat.
Jack Dorsey and Tristan O?Tierney first met at iPhoneDevCamp in 2008. Dorsey left Twitter shortly after and the two came up with the idea for Square. Dorsey worked on raising the funding and building the Square reader hardware. O?Tierney worked on the software end of the business, including the iOS application.
Ever since Square started, the company raised around $341 million and is processing over $10 billion in payments annually. Last month, Square even announced a new card swiper for iPad registers called “Stand.” Square Register launched Square Register in May 2011. Square also recently expanded to Japan and Canada.
O’Tierney is not the first major executive to have departed the company. Square COO Keith Rabois left due to a harassment case. Rabois is now a venture capitalist at Khosla Ventures.