In 1960, Arnold Palmer won the Masters in April and U.S. Open in June. According to his autobiography, "A Golfer's Life", he and his friend Bob Drum (of the Pittsburgh Press), while on the trans-Atlantic flight to The Open Championship at St Andrews, came up with the idea that adding it and the PGA Championship titles that July would constitute a modern Grand Slam. Drum spread the notion among the gathered media and it caught on. Two years earlier, the PGA had changed to stroke play, and it started to be held two weeks after the Open Championship in 1960. Scheduling problems continued through the 1960s as the last two majors were held in successive weeks in July on five occasions. The PGA was played in August in 1965 but returned to July for the next three. With the formation of the Tournament Players Division in late 1968, now the PGA Tour, the PGA Championship permanently moved to August in 1969, except for the 1971 edition, held in late February to avoid the summer heat of Florida.