The Best Cheesesteaks in Philadelphia | Bon Appétit
"Credited as the origin point of the cheesesteak after Pat Olivieri’s 1930s 'steak sandwich' at the corner of 9th Street and East Passyunk, the original preparation lacked cheese until an employee, Tony Lorenzo, added it in the late 1940s or early 1950s, helping to establish the modern cheesesteak tradition." - ByKae Lani Palmisano
