 At age twenty-one, he was the youngest licensed American trainer at that time.At Agua Caliente Racetrack, Threewitt saddled his first winner in 1932 and was on hand when the great Australian champion Phar Lap came that year to win the Agua Caliente Handicap.A year after Noble Threewitt became a trainer, he met and married Beryl Buck, the daughter of fellow trainer, William D. Buck.