Rehmannia is a Taoist Tonic Herbalist in the Gate of Life lineage, a 5000 year old herbal system from China. In 1998, he met Master herbalist Ron Teeguarden, and became his personal apprentice until 2006, and became inspired to design his own line of whole herb formulas. Rehmannia studied Chinese medical diagnosis at Alhambra University, and adheres to the title master Teeguarden gave him as "Superior herbalist."
Rehmannia is adept in the 5000 year old healing discipline called the Gate of Life lineage, which utilizes "Tonic" herbs to maintain balanced health. He has written 5 books, and works with Brynn Booth on developing products for Shaman Shack Herbs.