"Rudolf Flesch" was an Austrian-born naturalised American author (noted for his book "Why Johnny Can't Read"), and also a readability expert and writing consultant who was a vigorous proponent of plain English in the United States.

"Why Johnny Can't Read - 1950's Education",

Enotes.com, 2010, web:

[http://www.enotes.com/1950-education-american-decades/why-johnny-cant-read EN-Why].

He created the Flesch Reading Ease test and was co-creator of the Flesch-Kincaid readability test. Flesch advocated use of phonics rather than sight reading, to enable students to sound out unfamiliar words.

More Rudolf Flesch on Wikipedia.