In 1954, Argent joined the
Royal Horse Guards,
Household Cavalry, serving with the
Life Guards for nine years. In 1960, he became an Associate Member of the
Royal Photographic Society and won the British Army Photographic Competition. He photographed Field Marshal Sir
Gerald Templer, who encouraged him to pursue photography instead of staying in the military. Argent later recalled being told by Templer, "Don't get to my age and then regret what you might have been." Templer recommended Argent to
Sir John Miller, the
Crown Equerry, who hired him to photograph the
Royal Mews for a guidebook. Argent was commissioned to take the photographs for Judith Campbell's book
The Queen Rides, published in 1965, which featured the Queen with her horses at
Windsor Castle,
Sandringham House and
Balmoral Castle. He served as royal photographer until 1974, given unparalleled access to the Queen and her family. Among his notable portraits include
Prince Charles for the postage stamp marking his investiture as the prince of Wales in 1968, and the group portraits for the royal family's Christmas cards from 1966 to 1974. His most extraordinary royal portrait was probably his 1967 photo session with
Princess Alice of Battenberg, mother of
Prince Philip, Duke of Edinburgh, who had fallen ill. Worried she may not survive, the Queen sent Argent to the
King Edward VII Hospital to photograph Princess Alice, who was usually dressed as a nun in her later years, but was in her hospital gown. They were the final portraits taken of Princess Alice. In 1967 Argent became the official photographer for the National Photographic Record at the
National Portrait Gallery. From 1967 to 1993 Argent also served as official photographer for the
Royal Society, photographing scientists
Stephen Hawking, Sir
Peter Medawar,
Dorothy Hodgkin and
Francis Crick. He joined the photographic agency, Camera Press, founded by Tom Blau, who represented
Antony Armstrong-Jones, 1st Earl of Snowdon,
Patrick Anson, 5th Earl of Lichfield,
Cecil Beaton,
Norman Parkinson and
Yousuf Karsh, the latter whom Argent admired the most. Argent had London studios in
Queen's Gate and then in Holland Street in Kensington, where he became a celebrated photographer of prominent businessmen, families and soldiers. He also purchased the archives of prominent photographers
Walter Bird and
Baron. ==Personal life==