[1] He trained in Massachusetts in the 1890s "at the Museum of Fine Arts, under C. Howard Walker and Miss Elizabeth Child.
He was descended from John Hadaway (sometimes spelled Hathaway, 1617-1697) who was born in Symondsbury, Dorset, England and who emigrated to Massachusetts on the "Blessing" in 1635.
[7] William told his younger daughter Hilary that his first job was in a hardware shop where he "learnt the flashpoints of oils".
On 22 December 1894 he applied for an emergency passport in the US Embassy in Rome, in joint names, saying he was temporarily residing in Naples.
He met Jean Louise Carré (1865–1939), who had arrived in New York from Nova Scotia in September 1894 describing herself as a "tourist".
They married 1904, in St Pancras, when their first two children (Jean Carré, known as Jack, 1898-1950, and Lesley Anne, 1899-1985) were aged 6 and 5.
Lesley Anne married Basil Owen Ellis, who worked for a firm exporting leather from India.
Hilary qualified as a doctor, was a major in the Royal Army Medical Corps during World War 2 and spent the rest of her career working in public health in London.
William forged a highly successful artistic career in London, working as a designer, silversmith and teacher.
William also wrote monographs on cotton printing in the Madras presidency and Indian metalwork, copies of which may be found in the Victoria and Albert Museum.
When an unidentified epidemic involving swelling broke out in Madras in the early 1900s the British government asked Hadaway to commission a painting of a victim to assist with diagnosis.
In May 1945 his younger daughter Dr Hilary Hadaway, by now a Major in the Royal Army Medical Corps, flew to Nice with RAF Transport Command in order to recover his belongings, including furniture, artworks and papers.
There followed a legal dispute with the housekeeper over ownership of some items which she claimed had been given to her, after which Hilary managed to transport the bulk of his estate back to England.