William Portus Cullen, photo, University of Sydney Archives.

Following the ceremony in the Great Hall in June 1920 to confer the degree of Doctor of Laws ad eundem gradum upon His Royal Highness the Prince of Wales, the Prince responded to the address by Captain Allen, President of the Undergraduates Association, in the quadrangle. Chancellor The Hon Sir William Portus Cullen is standing behind the Prince of Wales, photo, University of Sydney Archives.

Chancellor William Portus Cullen on the far left and Sir Mungo MacCallum (Vice-Chancellor 1924-28) on the far right, 1920s, photo, Hood Collection, Mitchell Pictures, State Library of NSW.

Sir William Cullen in 1927, photo from the Sydney Medical School Senior Yearbook 1927-28, Faculty of Medicine Online Museum.

Sir William Cullen in 1928 at the ceremony for the Cook Bicentenary celebrations in Hyde Park, photo from 'The Sydney Morning Herald', 29 October 1928, NLA Newspapers.

From left Professor John Cavell Windeyer, Vice-Chancellor Sir Robert Wallace, Chancellor the Hon Sir William Portus Cullen and the Hon Frank Anstey, at the opening of the Commonwealth School of Public Health and Tropical Medicine in 1930, photo G3_224_0628, University of Sydney Archives.

A photo by Sam Hood taken at the University on ANZAC Day 1930 when several hundred people gathered in the University grounds to hear a carillon recital. An Army Chaplain and a General are at the front, with Chancellor Cullen standing behind wearing his Chancellor's robes and Sir Mungo MacCallum next to him, his face visible between the Chaplain and the General. Dr J C Bradfield is on the extreme right, photo, Mitchell Library of New South Wales, Digital order number: hood_04998.

The Hon Sir William Portus Cullen (centre) at the University Reunion Dinner held in the Refectory on 19 May 1930, with Vice-Chancellor Professor Robert Wallace and Miss Snyder on the left and Dr F W Bayldon and Professor Sir John Peden on the right, photo from 'The Sydney Morning Herald', 20 May 1930, NLA Newspapers.

Chancellor the Hon Sir William Portus Cullen greets His Royal Highness the Duke of Gloucester before the ceremony to confer the degree of Doctor of Laws ad eundem gradum upon the Duke, on 23 November 1934, photo, Hood collection, State Library of New South Wales, HA 3541 ... more.

His Royal Highness the Duke of Gloucester followed by Chancellor the Hon Sir William Portus Cullen and the academic procession after the conferring ceremony on 23 November 1934, photo, Hood collection, State Library of New South Wales, HA 3539 ... more.

Portrait of the Hon Sir William Portus Cullen KCMG by Jerrold Nathan (1899-1979), oil on canvas, University Art Collection, reproduced with the kind permission of Ms Felicity Brierley and the University of Sydney.