The authors of the original text
These people are Americans who've all been working towards peace and global unity.
Donald Neale Walsch is the author of Conversations with God
Marianne Williamson has been very involved in the Course in Miracles for years and has written several books on it
James Twyman is a musician/writer/ambassador of world peace
James Redfield is the author of The Celestine Prophecy
Doreen Virtue is a therapist/lecturer/healer who does a lot of speaking.
(Info from Diane Davalos - thanks Diane!)