He was the brother of Robert Samuel Maclay, a pioneer missionary to China; and the uncle of Robert Maclay Widney, a founder of the University of Southern California, and of Joseph Widney, the second president of the University of Southern California.
Robert Samuel Maclay (1824–1907), American Christian missionary to the Far East
He became an integral part of the Wesleyan mission in Japan, helping to found and serve as first president of the Anglo-Japanese College (now the Aoyama Gakuin) in Yokohama.
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