The Lord of the Green Dragons
Gnomish Master Cartographer and Guildmaster, Greyhawk
The guildmaster is the aged gnome and Master Cartographer, Jawan Sumbar, rumored to be centuries old and familiar with the whole Flanaess and areas beyond.
Though it is true he traveled to many such places, he last saw most of them a long time ago, and his memory of people and places is likely to be quite dated. Jawan and the other cartographers are very interested in any old maps that adventurers bring to them, and they will happily buy many such maps and unfamiliar books on geography.