Architect and property developer. The most successful property developer of Regency and Georgian London. He built over 3,000 properties, and his buildings covered over 250 acres of central London.
Born in Strand as James Haliburton. In 1794 he shortened his name following a family dispute. Lived for a time at Tavistock House. He and his wife Elizabeth had 6 sons and 6 daughters, including Septimus, Decimus the architect, and Octavia.
Died at St Leonards-On-Sea, the town he had designed and created.
His London developments include: Bloomsbury, Regent Street, Lower Regent Street, Swallow Street, St James's, Regent Park, Russell Square, Bedford Square, Bloomsbury Square, Tavistock Square, Chester Terrace, Cornwall Terrace, York Terrace, Clarence Terrace.