Who Is Robert Tisserand?

I found out about Robert Tisserand by reading an article about him in this magazine while waiting in a doctor's office in Santa Barbara, CA. So I took some pictures of the article...

Sorry this is sideways....

Here is a closer view. He is from London but sometimes comes to the US to give lectures.  He has his own website, of course and  if you are in the neighborhood, you can go to his June 2015 class in London....Pretty deep stuff. I would say he is the definitive expert in essential oils. By the way, when asked, he has said that DoTerra essential oils are very good.