Vocation : Medical : Technician

Ronald Clark O'Bryan (October 19, 1944 – March 31, 1984), nicknamed The Candy Man and The Man Who Killed Halloween, was an American man convicted of killing his eight-year-old son Timothy (April 5, 1966 – October 31, 1974) on Halloween 1974 with a potassium cyanide-laced Pixy Stix that was ostensibly collected during a trick or treat outing. O'Bryan poisoned his son in order to claim life insurance money to ease his own financial troubles, as he was $100,000 in debt. O'Bryan also distributed poisoned candy to his daughter and three other children in an attempt to cover up his crime; however, neither his daughter nor the other children ate the poisoned candy. He was convicted of capital murder in June 1975 and sentenced to death. He was executed by lethal injection in March 1984.

Ludwig Halberstädter (9 December 1876, in Beuthen, Oberschlesien – 20 August 1949) was a German-Jewish radiologist.
In 1901 he obtained his medical doctorate from the University of Breslau, and following graduation became an assistant to surgeon Carl Garré (1857–1928) at the University of Königsberg. Afterwards he returned to Breslau as an assistant to dermatologist Albert Neisser (1855–1916), under whose direction he participated on a medical research mission to Java (1907).
In 1922 he obtained his habilitation for dermatology and radiation therapy in Berlin. Here he became director of the radiation department at the Instituts für Krebsforschung (Institute for Cancer Research), Berlin-Dahlem. In this capacity he used thorium as a treatment for cancer. In 1933 he emigrated from Nazi Germany to Palestine, where he became director of radiation therapy at the Hadassah Hospital in Jerusalem. He died in New York City on August 20, 1949.
In 1905 he introduced radiation for ablation of the ovaries.

Yva (26 January 1900 – disappeared June 1942?; officially declared dead on 31 December 1944) was the professional pseudonym of Else Ernestine Neuländer-Simon who was a German Jewish photographer renowned for her dreamlike, multiple exposed images. She became a leading photographer in Berlin during the Weimar Republic.
When the Nazi Party came to power, she was forced into working as a radiographer. She was deported by the Gestapo in 1942 and murdered, probably in the Majdanek concentration camp during World War II.

Georg Carl Tänzler, also known as Count Carl von Cosel (February 8, 1877 – July 3, 1952), was a German-born radiology technologist at the Marine-Hospital Service in Key West, Florida. He developed an obsession with a young Cuban-American tuberculosis patient, Elena "Helen" Milagro de Hoyos (July 31, 1909 – October 25, 1931), that carried on well after her death. In 1933, almost two years after her death, Tanzler removed Hoyos' body from its tomb, and lived with the corpse at his home for seven years until its discovery by Hoyos' relatives and authorities in 1940.

Edward Bivens Singleton (October 22, 1920 – January 10, 2015) was an American physician and one of the early pediatric radiologists in the United States. He was the first physician hired by Texas Children's Hospital before it opened in the 1950s, and he practiced there until shortly before his death. He received awards for his career achievements from several radiology-related organizations.

Albert Besson (18 April 1896 – 17 May 1965) was a French hygienist, physician and member of the French Académie Nationale de Médecine.

Albert Londe (26 November 1858 – 11 September 1917) was a French photographer, medical researcher and chronophotographer. He is remembered for his work as a medical photographer at the Salpêtrière Hospital in Paris, funded by the Parisian authorities, as well as being a pioneer in X-ray photography.
During his two decades at the Salpêtrière, Albert Londe developed into arguably the most outstanding scientific photographer of his time.
In 1878 neurologist Jean-Martin Charcot hired Londe as a medical photographer at the Salpêtrière. In 1882 Londe devised a system to photograph the physical and muscular movements of patients (including individuals experiencing epileptic seizures). This he accomplished by using a camera with nine lenses that were triggered by electromagnetic energy, and with the use of a metronome he was able to sequentially time the release of the shutters, therefore taking photos onto glass plates in quick succession. A few years later Londe developed a camera with twelve lenses for photographing movement.
Londe's camera was also used for medical studies of muscle movement in subjects performing actions as diverse as those of a tightrope-walking and blacksmithing. The sequence of twelve pictures could be created for durations from 1/10 of a second to several seconds.
Although the apparatus was used primarily for medical research, Londe noted that it was portable, and he used it for other subjects - for example, horses and other animals and ocean waves. General Sobert developed, in conjunction with Londe, a chronophotographic device used to study ballistics. Londe's pictures were used as illustrations in several books, most notably those by Paul Richer, that were widely read by the medical and artistic fraternity.
With Étienne-Jules Marey (1830–1904), Londe performed many photographic experiments of movement, and the layout of his laboratory at the Salpêtrière was similar to Marey's renowned Station Physiologique. In 1893 Londe published the first book on medical photography, titled La photographie médicale: Application aux sciences médicales et physiologiques. In 1898 he published Traité pratique de radiographie et de radioscope: technique et applications médicales.
Londe also published six journals. Albert Londe's 12-lens camera of 1891 was illustrated in the journal 'La Nature', 1893.