IIRC, Don was the author of several important HomeBrew? hardware books in the late 70s and early 80s. Was it op amps or terminals?? -ScottElliott
Yes. _Active Filter Cookbook_ and _TV Typewriter_. He has a website at http://www.tinaja.com/
Also The RTL Cookbook, the TTL Cookbook, and several others.
He's been a rabid Postscript enthusiast and expert almost from the day Postscript was released. It's a programming language, not just a document format, btw, so he's an enthusiast in the sense that it's his favorite programming language.