Dan traveled to interview hundreds of people to form his class book Hang Gliding.
Later he revised the book many times. The influence of his book was huge.
Then he published book Kiting (on tow-launched hang gliding)
His years of parachute work and skydiving included published the tome The Parachute Manual.
He flew hang gliders as well; photo of his flying a hang glider is in one of his books.
