On the Internet Archive, I came across Bernard Shaw on Modern Typography, reprinted from The Caxton Magazine, by Horace Carr at "The Printing Press" in 1915. It piqued my interest, because it was in a very nice Jenson typeface, and I hadn't known that there were that many options of that kind available to printers then.
It was only a few pages long, with pairs of facing pages followed by pairs of blank pages. And at the end there were some testimonials to his work, so I assume it was a sample showpiece.
A web search turned up some basic information. As a young boy of 14, he came to Cleveland in 1883 and entered the printing trade as an apprentice. He started his own printing shop, "The Printing Press", in 1889, and he passed away on April 12, 1941.
As well, there definitely were indications that he was considered a master printer. But I haven't been able to find out much information about him.
If you wish to learn more, try placing a query on the Contact form on the American Printing History Association's website: www.printinghistory.org.
I wouldn’t assume that Goudy spaced Camelot himself—I suspect it was drawings he sent to J.W. Phinney. Leastways, I have that impression, from previous reading.
It is certainly possible that the surviving sample of Sherman was simply before Goudy spaced it at all. Although most type designers do some manner of spacing from the beginning, it being pre-spacing seems much more likely than Goudy not knowing how to space decently on his 21st type design.