Walter Stender (1905-2000) was a Latvian aero engineer who lived and worked most of his life in Germany. He had a variety of interests that included Atlantis. He was attracted to Spanuth’s theories and wrote a widely regarded article on Phaeton and its place in the Atlantis story 1n 1997. This is freely available online(a) and although in German, it translates reasonably well into English with the Google translator. A more extensive biography is available on the Atlantisforschung.de website(b).
*(a) http://www.efodon.de/html/archiv/vorgeschichte/stender/phaeton.htm (link broken Dec. 2018)*