For most questions, the fastest answer comes through the right community channel:
For Kuji Kiri, Ninjutsu, and the spiritual side of Japanese warrior arts
The English-speaking community is the Japanese Grimoire Society. Join there for direct dialogue, study materials, and to ask Mark questions inside the community space.
For Shingon Reiki questions
The home for Shingon Reiki is shingon-reiki.com — including the path of Shingon Reiki masters.
For wolf shamanism and shamanic warrior path
The home is shamanic-worlds.com.
Direct contact
For matters outside the community channels (press, academic inquiries, organisational questions), reach Mark via:
info [at] tengu-akasha-dojo.de
For matters that require deeper engagement — please join the Grimoire Society first. It's faster and Mark answers more directly there.