Casper E. Yost served as the president of all the companies. It was a confusing arrangement to regulators, employees and even to the parent company, AT&T. In a letter to AT&T, Yost explained that when he was answering a question, making a proposal or discussing a problem in his correspondence with AT&T, he would use the letterhead of the particular company to which the question, problem or proposal related. One problem with this arrangement, especially for local telephone staffers and historians, is that the carbons of Yost's letters contain no letterheads.