Dunstan was born on 24 May 1861 at
Chester Castle, where his father, John Dunstan (1797-1874), was Constable. He was educated at
Bedford School before becoming an assistant to
Theophilus Redwood, Professor of Chemistry at the
Royal Pharmaceutical Society in
London. In 1884, Dunstan was appointed as Demonstrator in the University Laboratories at the
University of Oxford and, in 1885, as University Lecturer in Chemistry. In 1886, he succeeded Redwood as Professor of Chemistry at the Royal Pharmaceutical Society and, in 1903, he was appointed Professor of Chemistry and Director of the
Imperial Institute in London. He acted as President of the International Association of Tropical Agriculture and was a Member of the Advisory Committee for Tropical Agriculture. In 1886, he married Emilie Fordyce Maclean. After she died in 1893, he married Violet Mary Claudia Hanbury-Tracy (1876-1963), daughter of
Frederick Hanbury-Tracy, in 1900. He died on 20 April 1949. ==References==