Disraeli's biographer Jonathan Parry writes that the financial failure and personal criticism that Disraeli suffered in 1825 and 1826 were probably the trigger for a serious nervous crisis affecting him over the next four years: "He had always been moody, sensitive, and solitary by nature, but now became seriously depressed and lethargic." He was still living with his parents in London, but in search of the "change of air" recommended by the family's doctors Isaac took a succession of houses in the country and on the coast, before Disraeli sought wider horizons.