Well, here's what I've come up with so far. I got this from our Corporate Archivist. I still have my feelers out there for the rest of it. I've put a call out to a couple marketing people who may have the information as well. This is the response I got from our archivist.
Anthony is correct about CF Frost, whose full name is Charles F. Frost. He worked as an account executive for Ogilvy & Mather, our advertising agency in the 1960s. JB Atkins was a former American Express employee named Jane Atkins. LA Webb is Lisa Webb, another former AXP employee. Lisa worked on the advertising campaign for the Blue from American Express Card in 1999, when we launched this product. I do not have information about Benjamin or Roeglin.
[It is important to note that for legal reasons American Express needs to use the name of an actual person, who has signed a contract with the company, granting American Express permission to use his or her name on a "dummy" card.]
I would think they would have more information about J L Benjamin considering that is the name we use on our dummy Centurion cards. I've got one in my desk right now and it has the same name and card number on it as the pictures you see of it. I'm sure it wasn't the one used in the pictures, but you never know...