That's a relatively new picture, so he looks US-SI !
He tried to create the "ultimate" drafting system, so there wouldn't be any fittings necessary. Well, he didn't quite succeed.
Mostly because he used a system from the 60's as a starting point. Verriboxy, verriboring, but also "verriprecise". I can't find the diagram right now, but there were more than 100 construction points in the front alone. Which makes the one problem that all drafting systems share even worse: Proper measuring and applying those measurements to the draft. Once your measurements are off and you have to use several formulas to create a front piece it gets totally wacko.
He probably thought that setting up a website and boasting on C&T what a great tailor he is would be enough to get rich clients through the door of his Houston suburb house.
His wife was paying all the bills, so after a few years of him playing "bespoke tailor" she must have had enough, hence his new job.
DZ is a very bitter character, which is sad, because he's a good tailor. Just doesn't have any clue about style and marketing.