Physicists at the Seventh Solvay Physics Conference, Brussels, Belgium, October 1933, 1933, Smithsonian Institution Archives, This image, which includes in the front row (at left) Irène Joliot-Curie (1897-1956) and (at right) her mother Marie Sklodowska Curie (1867-1934), and in back row (left) her husband Frédéric Joliot (1900-1958), is part of a photograph taken of all attendees. Nearly every major scientist interested in research relating to atomic physics attended that meeting. In the front row are Irene Curie, Niels Henrik David Bohr (1885-1962), Abram Fedorovich Ioffe (1880-1960), and Marie Curie; in the back row (from left) are Joliot, Werner Heisenberg (1901-1976), Hendrik Anthony Kramers (1894-1952), Ernst Stahel (b. 1896), Enrico Fermi (1901-1954), Ernest Thomas Sinton Walton (1903-1995), Paul Adrien Maurice Dirac (1902-1984), Peter Joseph William Debye (1884-1966), Nevill Francis Mott (1905-1996), and Blas Cabrera y Felipe (1878-1945). The black crop lines visible around Fermi's head were made by a Science Service editor..