Mari Hall
Mari Hall is an American that spent a number of years teaching Reiki in Europe. I really appreciated her book "Reiki and the Soul". She has written a number of Reiki books including Reiki for the Soul. She has many thought-provoking ideas about the nature of Reiki and the nature of the Soul that I really appreciate, and includes some interesting exercises in her teaching about how the body can influence the brain.
The Reiki Cross - Sit with your legs crossed. Cross your arms in the opposite way.. I.E. if your left leg is crossed over your right. Cross your right arm over your left. Sit there for several moments intending the Reiki energy to flow.. Reverse your hands and feet to balance the other side.
Mari has been to several Reiki retreats and I have always been eager to see what she had to say