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Patrick Collison

cofounder, Stripe

Stripe cofounders (and brothers) Patrick and John Collison are two of the most successful entrepreneurs to come out of Y Combinator's accelerator program. The natives of Limerick, Ireland built their first startup, Auctomatic, at Y Combinator in 2007, selling it for millions. Now, the YC alums have branched out on their own for their second company, white-hot payments startup Stripe.