I'm willing to bet that the teacher April had learned this technique from Louis Maestas or a student of his work. He uses the term "rub out" for his method, which he taught himself through the study of old master techniques. He is not a Frank Reilly protege, though the wipe out and wash in techniques are very similar.
Mr. Maestas creates finished works using this method as opposed to creating an underpainting over which to add color, make corrections, etc.
Click
here to read about him and see some of his works online. He paints a painting a day and spends an average of 2-3 hours on one work. His works are often monochromatic (in the umbers or siennas) but he also will add color to the wet work and wipe out with that as well. He does not paint on top of his works. I believe he is still teaching in the Albuquerque NM area.
I had the opportunity to visit this gallery (link above) in person on a recent trip to Sedona, Arizona, and was most impressed with the work, particularly as a student of Marvin's. Marvin teaches a modified version of the Reilly method which does involve the use of a controlled palette, which Marvin has altered to include the Paxton flesh palette. He has multiple demonstrations on his website,
here .
This is a really lovely work, April. I'm sure your husband's boss will be thrilled!