He emigrated to Queensland in 1866, where he immediately established himself as a builder and architect in
Dalby, on the
Darling Downs. In 1874 Marks moved to Toowoomba, where he practiced principally as an architect. On his elder son
Henry James (Harry) Marks becoming a partner in 1892, the firm of
James Marks and Son was established. This firm dominated the architectural profession in Toowoomba and district for more than half a century. ==Later life==