While I am the primary author and publisher, I've been a member of the Cartographers' Guild since 2007, participated in dozens of map challenges (contests) and won 4 of them. RobA, the assistant adminstrator of the Cartographers' Guild is writing the GIMP portions of the Explanation of Terms chapter of both the firs two guide books. Waldronate and Anna Meyer, both 3D cartographers and members of the guild will write a chapter each, if the 3D map tutorials guide gets funded. Finally Josephe Vandel, author and cartographer of our final stretch goal, though a newer member is also a regular at the CG.
You're getting 5 senior members of the Cartographers' Guild as authors in these guides.
Beside the techniques of these guides apply to many applications, no other map tutorials product approaches learning cartography this way, than these guides.