J. Grant Thiessen

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J. Grant Thiessen is a Canadian bibliographer and bookseller (Pandora's Books, BookIT Enterprises). He has worked primarily in the area of science fiction. His bibliographic fanzine, Science Fiction Collector, has been collected into three hardbound volumes from Pandora's Books, and copies of all of the issues are still available from that source.

The most frequently referenced work from these volumes is the guide to the Ace Books sf doubles; books bound dos-a-dos. This bibliography appeared in the first issue of Science Fiction Collector. Other paperback publishers whose output is documented by Thiessen includes Monarch Books, Curtis Books, and Lancer Books. The volumes also contain individual author biographies; authors covered include James H. Schmitz, Jack Williamson, E. C. Tubb, A. E. van Vogt, and Charles L. Harness.

Thiessen also published The Tanelorn Archives, a bibliography of Michael Moorcock, and has made many contributions to bibliographic reference works, magazines, and price guides, as well as producing several hundred book catalogs.

He was born in 1947 in Winnipeg, Manitoba, Canada. He acquired his CMA (Certified Management Accountant) degree in 1973. In 1977, he formally incorporated as Pandora's Books Ltd.

In 1995, Pandora's Books was an early retail entry on the internet, and still operates their web-site to this day.

He is now a bookseller and software developer, under the company name BookIT Enterprises Inc.