Who's Walter Lang?
I've heard of many people in Tae Kwon Do (some I wish I hadn't), but I've never heard of him.
Walter Lang is a Ch'ang H'on stylist, originally with the ITF - which is why you've probably never heard of him; the ITF isn't as widespread - and therefore not as publicized - as the WTF. At one point, he was the Vice President of the USTF, under GM Charles Sereff. For more information, check on our website.