The Collegium Geomanticum and its director John Michael Greer may be contacted online or by post. If you are sending a letter please include a self-addressed stamped envelope for the reply. Many thanks!
jmg (at) collegeofgeomancy.com. (The address is given in this form to keep spam robots from harvesting it; please replace the (at) with @ and remove all spaces.)
c/o John Michael Greer
PO Box 387
Ashland, OR 97520 USA