Well, for one,
Michael Tierra, a California herbalist, makes a great triphala. Tierra combines Ayurveda, Western, Native American and TCM. He also runs an herbal school.
A couple of other herbalists who fanned the flame of interest for me;
Jeanne Rose - the doyenne of California herbology. Her book, Herbs and Things, was my first herb book purchases in the wild 70's. Jeanne also has a school.
Susun Weed - without whom menopause could not be tolerated <grin>
The following listing gleaned from book "Herbal Pathfinders, voices of the Herb Renaissance" and the teachers at the Breitenbush Herbal Conference 2005
John Christopher - an educational site
Steven Foster - herbal photographer
Rosemary Gladstar - also a school
Vasant Lad - Lad brought Ayurveda to the West. He also runs THE school.
Adam Sellers - short bio page
Forest Shomer - Abundant Life Seeds is no longer. This page explains
Ed Smith - Herbal Ed of the Herm Pharm
Many of the herbalists listed here have biographys, CVs, and books included on other sites. Part of the fun researching is to find more and more information about 'unknown' herbalists. Have fun searching the unlinked folks!
Note: It sometimes helps to add the word 'herbalist' with the name in the search engine.