Contact Halkyon Guild & Dr. Johannes A. Niederhauser
You can contact us with any queries regarding our projects at Halkyon or if you'd like to donate to Halkyon.
You may also contact Dr. Niederhauser here.
All physical mail should be sent to Dr. Johannes Niederhauser 

N1 Mailbox

275 New N Rd, London, United Kingdom

Our registered office address is 167-169 Great Portland street, 5th Floor, London, W1W 5PF