We've been fortunate enough to have worked with Arion Press for as long as we've been in business. They're one of the world's top printers of fine books and if you're interested in letterpress (and you probably wouldn't be reading this if you aren't) you should know who they are.
The list of artists who've collaborated with them over the years is a who's who of the industry and their editions are collected by individuals, museums and libraries the world over. You can find more about that here.
You may not be as familiar with two of their other divisions: Their typecasting division, M & H Type, is the oldest and largest hot metal type foundry in the U.S. for letterpress printers. They also have a non-profit called The Grabhorn Institute"to preserve and perpetuate the use of one of the last integrated typefoundry, letterpress printing, and bookbinding facilities and to guide it into the future."