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I've linked the title to Glen Orbik's main website. I've taken quick sketch with the man and he is a modern master.
He learned from Fred Fixler, taking over his classes at the place I went to,
http://www.calartinst.com/
Fixler learned from Frank Reilly. So what is taught could be called the Reilly method.
Jeff Watts, Marty Davis, Jeff Wand, Jeremy Lipking, Tony Pro lots of really good artists have benefited from this course of study.
Anyway, check out his amazing work.
I fixed the broke link issue. Definitely surf around on the site