Author: Samar Marwan / Source: Forbes

Square co-founder, Tristan O’Tierney, the engineer credited with developing the payment company’s first iPhone app, died in a Florida hospital on Feb.
23. He was 35.O’Tierney had been seeking treatment at an Ocala rehabilitation center. The official cause of death has not been released. His mother, Pamela Tierney, told the San Francisco Chronicle, “I do know that it was in relation to his addiction.”
Jack Dorsey recruited O’Tierney in 2009, illustrating for him his vision for Square via a series of napkin sketches on how a smartphone credit card app might work, which were later displayed in Square’s San Francisco offices. Dorsey and O’Tierney, along with Jim McKelvey, launched the company that year.
O’Tierney departed Square in 2013. “In another life, I helped…
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