Jon is starting to read Poul Anderson with what I call "Star Time," i.e., The Star Fox and Fire Time. (See here and here.) Thus, he has still to read, among many other works:
the Time Patrol series;
the History of Technic Civilization;
The King Of Ys (with Karen Anderson);
the Harvest of Stars tetralogy;
Genesis (the sf novel by Anderson, not the Biblical book of the same name);
Anderson's heroic fantasies;
It is good to know of someone who is only just embarking on this epic cosmic reading experience.