sentences:  Lockhart began his sports administration career by promoting amateur boxing at the Old Madison Square Garden, and soon became vice-president of the Metropolitan Association of the Amateur Athletic Union (AAU) of the United States, before serving as vice-chairman of USA Boxing for four years.He was asked by the Garden's ownership to manage its amateur hockey games in addition to boxing, and he was successful in making Sunday afternoon amateur hockey profitable, while also serving as vice-president of the Metropolitan Amateur Hockey League (MAHL) for eighteen years, starting in 1934.Lockhart looked to increase exposure for the New York amateur teams by seeking a league for them to play in regularly.