Mason was born in
Kilkenny in Ireland. He was adopted as a child and took the name James Mason (his original birth name was unknown) when his family moved to the United States in 1861. There he learned chess and eventually secured a job at the
New York Herald. Mason made his first mark on the chess scene in 1876 when he won the
Fourth American Chess Congress in Philadelphia, the New York Clipper tournament, and defeated
Henry Bird in a match by the comfortable margin of 13–6. In 1878 he settled in England. he finished tied for 12th–14th with 9½ points of 21 possible. Mason wrote several books on chess, the most popular being
The Principles of Chess in Theory and Practice (1894),
The Art of Chess (1895),
Chess Openings (1897) and
Social Chess (1900). In 1903 he became seriously ill and had to curtail almost all activities for the remainder of his life. He died on 12 January 1905 in
Rochford, Essex, and is buried in nearby
Thundersley churchyard. ==Chess strength==