He also founded the publishing house Ansata-Verlag, which specialized in studies on esotericism, based first in Schwarzenburg and then in Interlaken (Switzerland).
[citation needed] In 1996, he created an academic journal focused on the study of esotericism, Gnostika,[1] of which he remains co-editor to this date.
Hakl has contributed material on matters related to esotericism to several international dictionaries and journals, such as Politica Hermetica, where he publishes book reviews.
He has published a book on the Eranos series of colloquia initiated by Carl Gustav Jung and attended by names such as Mircea Eliade and several specialists of western esotericism and religious studies.
[2] An English translation by Nicholas Goodrick-Clarke of his book Unknown Sources: National Socialism and the Occult was published in 2000.