I've heard of him. Waldo Emerson Rosebush lived from 1889 to 1961, was a manager of a paper company, received several patents, wrote several books and other articles, joined Gen John J. Pershing in an expedition to Mexico to get Pancho Villa, was a Major in WWI, among other things.
But I did'nt know he worked with Bill Ruger. Where did you find that? Sounds interesting.