Helmut,
I must be mistaken; I have always assumed that the spelling, Hansen, indicated Danish ancestry while, Hanson, indicated German. Regardless, I would imagine both names are somehow closely related.
I followed the link to Ole Nydahl's website which is very interesting indeed. Here in Houston, Texas, we have the Dawn Mountain Temple, a temple in the Tibetan tradition. I've been practicing various forms of Hatha Yoga, Mantra Yoga, and Pranayama for a number of years but have never had any formal training. In spite of the lack of training I have realized some rather formidable results. I did engage in some informal studies (Pali chanting and meditation primarily) at Buumon Temple in Port Arthur, Texas. The Most Reverend Viet, the founder and senior Abbot of Buumon is a first class gardener! He has some exquisite lotus and lily ponds and over 30 varieties of bamboo growing; he even has a Bodhi tree on site!
My spiritual journy was really inspired by His Holiness the Dalai Lama. I read a book by the philosopher, Renee Weber, A Dialogue Between Scientists and Sages, several years ago in which she included an interview with His Holiness and the Quantum Physicist, David Bohm. Dr. Bohm asked His Holiness if there was ever a situation in which a Buddhist was justified in taking another human's life. His Holiness answered that there was a situation in which a Buddhist would be, not only spiritually justified, but spiritually responsible for taking another human's life. This situation would be if the Buddhist had prior knowledge that another human planned to take the lives of multiple beings (more than one human). In such a situation the Buddhist would be Karmically required to shoulder the Karmic burden of the one death in order to spare the would be killer the tremendous Karmic burden of multiple deaths. Of course proper and improper motivation also plays a role. I found His Holiness' answer rather profound and decided I had better start reading some of his books! The rest is, shall we say, synchronicity . . .
Best regards,
Wes Hansen