John Sievert
4 January 1948 – 20 August 1989
John Sievert is a pseudonym of Jan Stacy, an American writer of military science fiction and non-fiction books, many of which were co-authored by Ryder Syvertsen.
4 January 1948 – 20 August 1989
John Sievert is a pseudonym of Jan Stacy, an American writer of military science fiction and non-fiction books, many of which were co-authored by Ryder Syvertsen.
