This had to be the most amazing merchandising operation I had ever seen! I don't remember whether I ate a hamburger for lunch that day or not. I went back to my car and waited around until about 2:30 in the afternoon, when the crowd dwindled down to just an occasional customer. Then I went over to the building and introduced myself to Mac and Dick McDonald. (very previously) Like many of the 20th century's most influential entrepreneurs, Ray Kroc was not a creator. When Kroc came onto the scene, convenience food already existed in many forms, from local diners to hot dog stands. But it was Kroc who had the cunning ability to grasp all the complexities of the fast-food concept and deliver it in the best possible way.