10 April] 1879 in Tallinn – 2 February 1939 in Berlin) was a Baltic German chess master.

10 April] 1879 in Reval, Governorate of Estonia, Russian Empire (now Tallinn, Estonia) as a son of advocate Ferdinand Oscar Gregory (born 1843 in Kolu Manor, Heinrichshof, now in Vaiatu village) and Alexandrine Emmi Gregory (born 1854 in Vändra).

The couple lived in Schöneberg, Berlin, and had two daughters, Iselin (1903) and Maud Dolly (1905).

In 1904, he shared 1st in Reval, and tied for 7–8th in Coburg (14th DSB–Congress, Hauptturnier, Augustin Neumann and Milan Vidmar won).

[4] In 1913/14, he tied for 17–18th in St Petersburg (All-Russian Masters’ Tournament, 8th RUS-ch, Alekhine and Aron Nimzowitsch won).