Born in Haslemere, Surrey, John Penfold was a surveyor and architect, who is best known for designing the hexagonal Penfold post box in 1866.
Penfold was the President of the Architectural Association School of Architecture (1859–1860) and an associate of the Royal Institute of British Architects, before being made a fellow in 1881. He was also a founding member of the Royal Institution of Chartered Surveyors and sat as its Honorary Secretary from 1868 to 1904.