Well, the stack and tilt was formed by two men by the names of Andy Plumber and Mike Bennett, (who, at that time were teaching people how to use their unbelievable swing method on and off the PGA tour) they invented the stack and tilt to help all players find their proper golf form and use the stack and tilt swing to hit the ball correctly each and every time.
Today there are over 18 pro golfers including Aaron Baddeley (who are currently playing on the PGA golf tour) that are using this type of golf swing Why? Because they feel that they have more control over their swing and they are having great success with it. The stack and tilt golf swing breaks the tradition of keeping your arms straight, it will also help players drive the ball longer and will make you much more comfortable as you swing your golf club.
This method of golf swing requires you to turn your shoulders in a circle, so you always hit the ground under the ball in the exact same spot each and every time. As well as moving the shoulders the spine is moving too, the spine is tilting as you move to hit the golf ball.
This is revolutionary stuff, because we as golfers have always been told to keep the shoulders straight and not to move them. The reason why this golfing method is called the Stand and Tilt is because your stacked up at a hips and to stay stacked your tilting your spine.