Gregg helped develop Palmer method?

The article attached says that Palmer and Gregg worked together to develop the Palmer method of handwriting.  The man quoted used to work for the Palmer company so is probably a trusted source.

"A.N. Palmer and John Robert Gregg, believing Spencerian writing was too difficult, developed the more plain, muscular movement of the Palmer method, Tufo said. By 1920, 90 percent of all schools in the U.S. were using the Palmer method."

Am i reading this correctly?  Is this common knowledge?

(by Ryan for group greggshorthand)

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