Oh yes, I loved the work of David Hawkins, it changed my life 6-7 years ago. Read two of his books, "Power vs Force" which is an excellent explanation of how the scale of consciousness works, how to use muscle testing to determine anything etc, and "Letting go - the pathway to surrender", this one is really enlightening on how to let go of fear and other related emotions/states. Happy you found it interesting too, as you said it's a really practical teaching. :)