At an April 2007 symposium, authors Kai Bird and Svetlana Chervonnaya postulated that, based on the movements of officials present at Yalta, Wilder Foote, a U.S. diplomat, not Hiss, was the best match for ALES. They note Foote was in Mexico City when a Soviet cable placed ALES there, whereas Hiss had left several days earlier for Washington (see above). In response, Haynes and Klehr point out that Foote doesn't fit other aspects of the description of ALES (Foote was publishing newspapers in Vermont at the time when ALES was said to have been working for Soviet military intelligence) and suggest that the cable came from someone who managed KGB assets (rather than GRU assets like ALES) and may have been mistaken when he stated that ALES was still in Mexico City. Mark also disputes that Foote was ALES, arguing that Foote was never shown to be associated with the communists or any foreign intelligence services; Hiss was the "one possible candidate" who could have been ALES, Mark contends.