Dear Molly,
I appreciate your posting of info on Mr. Maestas. His technique appears very smilar to Reilly's. I do, however, know that Reilly was not the first to teach the so-called wash-in technique. It was particular to Reilly's instruction, yes, but he didn't pull anything out of thin air. Monochromatic means having a single (or limited) hue(s) involved. Almost all underpainting techniques are, therefore, "monochromatic". The uses of Burnt and/or Raw Umber is because they dry overnight, and, thus, can be painted over the next day without lifting. For that reason, the slower drying Siennas are generally not used at this stage.
Nice as Mr. Maestas work may be, without having met Reilly, he could still have learned Reilly's technique else where. He had hundreds of students!!
By the way, 'forgot to mention it last time, another teacher influenced by Reilly's instruction, a Mr. Thomas Ouellette. He studied under a former protege of Reilly, Michael Aviano. He used (and probably still does) to teach in Back Bay, Boston.
More info on:
www.realistpainter.com
Enjoy,
a.