A high quality writer and an impressive rigor, allowing us to delve into his books and drink his words! Indeed, too often the perpetrators of anticipation SF are not very rational or gifted in science, even more fundamental physics (eg. Start Wars and the sound of gunfire in the area eg .. no air in space so no noise .. damage ..) Anyway Master Sawyer researched before writing anything, that's obvious. Because it is very hard to find any mistakes and yet his stories are full of interesting ideas from every point of view and innovative addition !!
In short, a delight to the imagination and anticipation of our probable future.