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Training an Heir. Nor is one-man control likely to be reasserted any time soon. Marshall Field V, a Harvard graduate now working at the New York Herald Tribune, will replace his father as a trustee when he turns 25 next May. But he will not become publisher of his father's newspapers until the trustees consider him "sufficiently trained." When his only brother Frederick, now 13, reaches 25, according to the terms set by Marshall Field III, the trust, which now holds two-thirds of the corporation's stock, may be dissolved. Then the two Field brothers can take over to run the family enterprises in whatever way they see fit.