He was inspired by the British Society for Psychical Research, and with philosopher Traugott Konstantin Oesterreich (1880-1949) tried to establish a similar institute in Germany.
Konstantin Simonov | Konstantin Zatulin | Konstantin Wecker | Konstantin Krause | Konstantin Kinchev | Konstantin Ushinsky | Konstantin Thon | Konstantin Somov | Konstantin Biebl | Grand Duke Konstantin Nikolayevich of Russia | Konstantin Rykov | Konstantin Raikin | Konstantin Paustovsky | Konstantin Novoselov | Konstantin Melnikov | Konstantin Meladze | Konstantin Leselidze | Konstantin Chernenko | Konstantin Buteyko | Traugott Konstantin Oesterreich | Traugott Herr | ''The Bulgarian martyresses'' by Konstantin Makovsky | ''The Bulgarian Martyresses'' (1877), a painting by Konstantin Makovsky | Phil Konstantin | Konstantin Trenyov | Konstantin Svechkar | Konstantin Rokossovsky | Konstantin Pobedonostsev | Konstantin Mikhailov | Konstantin Kuznetsov (cinematographer) |