The author of Sorcerer’s Screed called himself Skuggi (or Shadow in English), but his actual name was Jochum Magnús Eggertsson (1896-1966). He was a jack-of-all-trades and prolific polymath. Among other things he studied agriculture, mainly focusing on dairy and cheese making, worked as a fisherman and was involved with forestry and soil conservation.
He had an ardour for natural sciences and rock collection, as well as being a studious author and scholar. The claims about his studious scholarly work cannot be contested as he left behind a vast collection of books, journals and articles about his variegated and unique fields of interest.
Skuggi became notorious for his original theories about an exotic but flourishing culture in Iceland long before the Nordic settlement with the publication of his controversial book Brísingarmen Freyju, where a well travelled Celtic tribe roamed the barren island with a camel convoy, laying the foundation for the literary heritage that Icelanders are still boasting about on special occasions.
Skuggi was known to be boisterous and his criticism of Christianity in the foreword and afterword of The Sorcerer’s Screed seem to indicate a strong but bitter character. Sorcerer’s Screed is sort of “clef d’ouvre” or key to his entire body of work and view of life, even though (and perhaps mainly because) it is an amalgamation of ideas from past centuries and different times.
The text above is from the preface of Sorcerer's Screed.