Hartwig Cassel (November 2, 1850 in Konitz, West Prussia (now Chojnice, Poland) – 1929) was a chess journalist, editor and promoter in Great Britain and the United States of America. Cassel was born at Konitz, where his father, Dr. Aaron Cassel, was rabbi, and was educated at the Real-Gymnasium in Landsberg an der Warthe (now Gorzów Wielkopolski, Poland). In 1879 he went to Britain. He lived in Scotland, where he was a member of the Glasgow Chess Club, and later moved to Bradford, Yorkshire, where he began his journalistic career as the chess editor of the Observer-Budget. He wrote chess articles for the metropolitan and provincial English papers, organized the Yorkshire County Chess Club, arranged the Joseph Henry Blackburne-Isidor Gunsberg match at Bradford (1887) and the International C