Thomas Dickson Armour was a Scottish-American professional golfer nicknamed 'The Silver Scot'. He was a major force in the sport, winning three major championships: the 1927 U.S. Open, the 1930 PGA Championship, and the 1931 Open Championship. After his playing career, Armour became one of the most renowned and financially successful golf instructors of his time. His 1952 book, 'How to Play Your Best Golf All the Time', became a massive bestseller and is considered a classic of golf instruction.