Isn't technical analysis basically a kind of stripped-down version of quantitative analysis focusing on relatively easy to compute and/or eyeball trend statistics?
It's more like using statistical regression methods and Microsoft Paint to find patterns in tea leaves, but as long as you use disciplined money management and avoid major losses you can still make money at it.
The only thing I know about Dan Zanger was when he was featured in one of the trading magazines many years ago, in an article discussing his feat. He accomplished it during the 90s tech boom, when you couldn't lose money even if you tried. No idea what he did after that.