He sits at a nondescript desk in the SoHo headquarters of Foursquare , the location - sharing app he co-founded eight years ago .
NEW YORK -- Dennis Crowley hunches over a laptop , plaid fleece hat covering his signature tufts of boyish hair .
Dennis Crowley sits at a nondescript desk in the SoHo headquarters of Foursquare , the location - sharing app Dennis Crowley co-founded eight years ago .
NEW YORK -- Dennis Crowley hunches over a laptop , plaid fleece hat covering his signature tufts of boyish hair .