I knew Eddie Fields since 1965, when I first saw him perform two-person mentalism with "Professor" George Martz, in the Chicago Woolworth store. Their demonstration was done as a prelude to the sale of horoscopes -- and I cannot overestimate the inspiration that act gave me. Eddie and George performed their 10-minute act and spiel about twice an hour -- and I basically gave up attending classes at Univ of Chicago for about two months (really), just to go downtown every morning and camp out at Woolworth's to watch them, over and over again. I then spent day after day in the restaurant/bar across from Woolworth's (where George unfortunately would drink his share of their profits) chatting with them about all things mental (and cards with Eddie). Eddie gave me much encouragement in forming my own two person mindreading act, but he didn't give away the particular code they used (it was their bread and butter, and I never asked them for it) but the anecdotes,experiences (and some exaggerations) Eddie had were voluminous.
Keep in mind that their presentation of George's mental powers was not a "class" act; indeed, far better: it didn't come across as an "act" at all! Even though Eddie was the brains and the architect of the act (he had taught it to George), he knew what it took to make it look genuine, namely: it appeared to be simply a one-person act, because Eddie was so innocuous, he blended into the woodwork (or, more accurately, into the Woolworth, because many spectators thought he was simply an employee of the store). He was a master of becoming "invisible" as he moved among the crowd, mumbling first to one person, then another, and occasionally asking George "can you please tell this lady her birthday." He was (in much of what he did, including his cons) the quintessential non-entity -- which was a carefully maintained and cultivated part of his personality, and was a key to his success.
Eddie was a real character, and he "played" you (he played everyone) whenever he talked with you. He always hinted at "more to come", deeper secrets he might reveal, newer methods that only he knew. He enticed, teased, and sometimes he actually had something to reveal. But the con man role was not just an image he could don when he needed it; it was part of his very being. He was always selling the sizzle, but not with a hard sell -- it was just a wink, a smile, a subtle suggestion that there was more, if you only hung around a bit.
And now we'll never know what he might have had to tell ...