Surveyor and civil engineer. Son of Edward Cresy (1792–1858), the architect and civil engineer. Worked as an architectural draftsman in his father’s office as a young man. Assisted his father in preparing his Cyclopædia of civil engineering in 1845. Assistant surveyor under the commissioners of sewers, 1849; afterwards engineer. Principal assistant clerk at the Metropolitan Board of Works, 1859. Architect to the fire brigade, 1866. Founder member of the Geologists’ Association, 1858; president, 1864–5; vice-president, 1865–70.