Beisswenger, Heidrun
Heidrun Beisswenger (1935- ) is a retired German schoolteacher who has written on a range of subjects including Atlantis. She closely follows the ideas of Jürgen Spanuth, locating Atlantis in the region of Helgoland and claiming that it was destroyed by a meteorite. She accepts Spanuth’s date of 1200 BC as the date of Atlantis’ demise as well as identifying amber as orichalcum. However, she allows her inventive side to take over when she claims that Diodorus Siculus visited Helgoland(a), which was not something that Spanuth had ever suggested.
(a) https://www.philognosie.net/index.php/article/articleview/585/