Info on a Choy Lay Fut teacher?

[sifucicco]

I have a very nice and seemingly rare book by a Mr William Cheung. Does anyone have any information on this teacher or his lineage?
Thanks!

[GeneChing]

Here's one that mention him by name: William Cheung's ANTI-CLF Tactics (http://www.kungfumagazine.com/forum/showthread.php?59961)

[Firehawk4]

William Cheung is a wing chun teacher and wrote a book about how to defeat choy lai fut with wing chun .