Jessen, Professor Otto
Professor Otto Jessen (1891-1951) of Tubingen in Germany was another of a number of German academics, such as Schulten & Hennig, who, in the early part of the 20th century, were convinced that the answer to the Atlantis mystery lay in Southern Spain. Jessen excavated at the mouth of the Guadalquivir in Spain in a quest for Tartessos, which he believed to be Atlantis.
*In the early 1920’s he carried studies of the Strait of Gibraltar, the results of which were published in 1927.
Atlantisforschung.de gives a good overview of his life and work(a).