For me,
A better answer would be who I didn't like. Not that I really didn't like any of them, but O'Conner is the only one I didn't read. He wrote mostly for Field & Stream, and I rarely read them in those days, as they didn't have enough about shooting to hold my interest. Added to that is it seemed everytime I read anything of his, it was all .270 Winchester. Not that the .270 isn't a great round, I was just never a fan.
Virtually all of the writers in Guns & Ammo and Shooting Times and, of course the American Rifleman were not only the leading technical writers and experts of their day, they were often the leading expirimentors and innovators of the era. My reading of these mags only goes back (full time) to the 1950s, but I have read nearly everything they wrote that was published in the magazines, and several of their books as well.
It is amusing to me, to hear these writers referred to as "old school". I guess that dates me pretty well. To me, the current crop of writers has only a couple of people that may someday approach the status of the leastof the "old School" writers. There are some who show some promise, but I doubt they will have the opportunities to get the expierence that was formed the knowledge base for these "old school" writers.
The overwhelming majority of the art and skill of personal weaponscraft today is directly attributible to some of these men. There are very popular cartridges and guns that exist today only because of the actions and writing of some of these men, which spurred insightful industry individuals to create them.
I cannot urge those of you not familiar with their works, strongly enough, to go, find them and read them while they are still easily available. Don't get your knowledge of these great pioneers just from a Wikipedia entry.
I know there are a lot of you out there who don't know, or don't know much of these works, and may not consider them realtive to today, but so much of what we enjoy today is a result of their work that you owe it to yourself to learn about it and the men who made it happen.
Not too long ago I read a response in a thread, "Who is this Keith everyone is talking about?", and I was stunned. Not at the question, but about the fact that I realized that there are people for whom these "old school" writers are not familiar old friends. And that I had forgotten they are out there.
Brothers and Sisters, there are lost brethern out there, seeking the light! In the fashion of the guilds of old, it is the responsibility of the masters and the journeymen to teach the apprentice. Teach them the truths of the art, the ones that the "old school" writers spent their lives learning and passing on to us.
One thing you can get from these "old school" gentlemen is a firm foundation on which to build, along with an understanding of the times and limitations under which they labored. And you can get quite a bit of entertainment at the same time.
There are, of course, those apprentices out there who already believe they know it all. For them, all we can hope is that when life gets around to teaching them what they do not know, it doesn't hurt too much.