Jürgen Spanuth was a German classicist and theologian. He wrote three major works on Atlantis, atleast two being translated into English shortly after their German publication, the first being Atlantis: the Mystery Unravelled (1953, tr. 1956), the second solely titled Atlantis (1965) and the third Atlantis of the North (1976, tr. 1979).
Spanuth's approach to Atlantis was professional, as a classical scholar he had access to many ancient inscriptions, writings and fragments (especially Greek) and his expertise in this field meant he could quote and examine them in great detail. His original book 'Atlantis the mystery unravelled' was the most comprehenesive containing a massive amount of referenced classical sources. The purpose of Atlantis of the North (as the introduction states on the first few pages) was merely to be a ''shorter version'' of the original, for better access and understanding for the reader. There are still hundreds of classical sources however found cited throughout the book.
Spanuth made some unique identifications and discoveries about Atlantis no other had before his time, all of these are presented in his excellent book. Firstly, he was the first to discover that the 'Atlantic Ocean' of the ancient Greeks was not confined to the Atlantic we know today in the west, but also the Arctic Ocean or North Sea. Ancient Greek poets (i.e Euripides) placed Atlas (the bearer of the world-pillar) in the extreme north, not the west. The waters that surrounded Atlas were called the 'Atlantic sea', and as Spanuth discovered most ancient Greek writers placed this sea in the far north. There are many other unique findings Spanuth wrote about, he identified the Atlanteans Plato wrote about who invaded Libya and Egypt as being the mysterious 'Sea Peoples' who attacked parts of Southern Europe and North Africa around 1200BC. His evidence again being professional - translated egyptian inscriptions and papyrus such as the Medinet Habu texts, which identify the 'Sea Peoples' as coming a homeland from the far north. Spanuth identified this homeland, as being the North Sea.
Spanuth's personal identification of Atlantis was with Heligoland, a small Island within the North Sea - just off the coast of Germany. Now he may have been wrong about specifically Heligoland, but his identification with the North Sea i believe was spot on. Buy and read his work to see all the evidence. This is top scholar material, backed up with lots and lots of classical documentation. Spanuth stuck to Plato's original writings on Atlantis, which is precisely why his work should be read, he was not a crackpot linking Atlantis to aliens or powerful technology you today hear with New-Ager type authors, he was a genuine well educated classicist. I believe Spanuth got very close to the absolute truth regarding Atlantis, and he did this just soley by studying Plato's account and classical sources. Other men for hundreds of years made the mistake of adding to Plato's writings on Atlantis and twisting or inventing what they wished to see.