Born in Hamilton, Ontario, Canada, Andrew Miller studied at Exeter College before graduating in 1880 from Harvard University where he was a classmate of Theodore Roosevelt.
Andrew Miller owned racehorses for more than thirty years, starting with trotters and steeplechase runners before becoming heavily involved with racing Thoroughbreds on the flat.
Among his other racing successes, Andrew Miller's filly Lady Rotha won the Amsterdam and Travers Stakes in 1915.
His colt, Ticket won the 1916 Tremont Stakes at age two and finished second as the favorite in the 1917 Kentucky Derby.
He was President of the Driving Club of New York which operated the Fleetwood Park Racetrack harness racing track in Westchester County, New York, he was a Steward with the Jockey Club, Secretary and Treasurer of the Saratoga Racing Association, and a Steward at Morris Park Racecourse.