His healings have been medically verified and documented. You can listen to some of these testimonials in a documentary on his life and work. The Circle of Friends, a group set up in 1979, 20 years after Groening's death, organizes free talks to practice and spread his teachings around the world.
Groening died of stomach cancer in 1959. I am puzzled though as to why he wasn't able to turn his healing powers on himself. I found the answer in another article about his final days. Do read. A truly incredible story.
Before you dismiss Groening as another charlatan or shaman, you might want to also read Dr Amir's article. It gives a detailed background of Groening's life and teachings. A Google search of my own revealed more fascinating details about this spiritual healer. Below are the links and videos that I have checked out.
If your interest goes beyond just reading and viewing videos of Groening and his teachings, there is a free introductory talk given by the Circle of Friends right here in Kuala Lumpur.
Date: Saturday 11 August, 7 pm; Sunday 12 August, 11 am, 2.00pm and 5.00pm
Venue: PMCC International Sdn Bhd, Unit 17-3A, 3rd Mile Square, 151, Jln Klang Lama, KL
To register, email firstname.lastname@example.org
If you would like to get an idea of what the talk is about, you may want to read this first and then decide if you want to attend the talk. It might not be everyone's cup of tea.
For more about Bruno Groening, please visit http://www.bruno-groening.org/english/