Ambrose was a brilliant pure mathematician, apparently the youngest professor of Pure Maths in his day.
His cousin and brother-in-law Jeremy North writes: “ Visiting Joe and Ambrose in Gray Close, Hampstead, was always amazing. Ambrose had the largest desk piled high with totally incomprehensible research papers Towards the end of his life he had to have a second desk which quickly became covered too. At the last Birthday party I attended there, the room was full of mathematical colleagues who might have been on a different planet. Over these occasions my sister presided invariably with a cold collage for lunch or a polite tea. Domestic considerations were never high on their agenda.