A half-length portrait facing to the left, in a black coat, within a painted oval. The sitter was the youngest son of Captain William Locker (1731–1800), ultimately the Lieutenant-Governor of Greenwich Hospital. Educated at Eton, he entered the civil side of the Navy and in 1804 became secretary to Sir Edward Pellew (later Viscount Exmouth) a post he retained until 1814. In 1819 he became secretary of Greenwich Hospital and civil commissioner in 1829, a post he held until his retirement in 1844. Locker was a major reformer of Hospital affairs, and a significant establishment figure with many friends in artistic and literary circles including Robert Southey, Sir Walter Scott and Sir Thomas Lawrence. In the early 1820s he founded a counter-radical journal called 'The Plain Englishman' and in 1823–1824 he carried through the project originally thought of by his father to have a 'national gallery' of naval pictures and portraiture in the Painted Hall at Greenwich.