Mengele’s Auschwitz selections and human experiments

Josef Mengele’s Auschwitz selections and human experiments joined the power to determine prisoners’ immediate fates with a research program that treated people as material for Nazi racial aims. At Auschwitz concentration camp, Mengele directed arrivals toward forced labor or death and used prisoners, especially twins, in experiments conducted without their consent. The accounts of physician and prisoner Miklós Nyiszli, the surviving records described in the narrative, and Mengele’s later defense reveal both the organized character of the work and the gap between its scientific language and its consequences.

Position and Purpose

From May 1943 to January 1945, Mengele served at Auschwitz concentration camp as a physician with authority over selection on the arrival platform. The narrative places his work within a racial project: he sought knowledge about heredity and twin births, while also imagining that such research would contribute to a stronger, racially defined German population. In this framework, medical authority did not protect prisoners. It helped classify them according to the purposes of the camp and the research being pursued there.

The scale of arrivals made selection a recurring operation rather than an isolated decision. Nyiszli describes four or five trainloads of deported Hungarians arriving daily, with Mengele spending long periods at the platform and directing people toward different outcomes. The book also situates this period amid the deportation of 440,000 Hungarian Jews. Mengele’s composure during selection contrasts with the gravity of what his decisions meant: his role was not merely to observe a process but to exercise authority within it.

Selection and Its Consequences

Selection divided prisoners between forced labor and immediate death. Mengele presented the distinction as a judgment about who could work, but the classification itself took place inside a system designed to exploit and kill. His later description of Auschwitz as a labor camp, and of selection as a means of saving those deemed able to work, recast the operation in utilitarian terms. That account leaves out the coercive conditions that governed the prisoners and the fact that those judged unfit were killed.

The selections also connected the platform to the experimental work. Prisoners identified for their bodily characteristics, including twins, dwarfs, and people with disabilities, could be diverted to Mengele’s research. In the narrative’s stark contrast, the same authority that sorted arriving people also supplied the laboratory with its subjects. The categories used to identify potential research material were not neutral descriptions: under Mengele’s control, they could determine whether a person was subjected to experimentation or sent to die.

Experiments and Institutional Connections

Nyiszli, a Jewish physician and one of the Sonderkommando prisoners, was forced to assist Mengele. In the summer and autumn of 1944, his medical knowledge was put to work for the camp’s research. He describes examinations of twins and dwarfs that included blood tests, spinal tests, and transfusions between twins, alongside other procedures. The work was imposed on prisoners, and its stated aim of studying hereditary traits did not alter the absence of consent or the danger to those examined.

The experiments could also end in the prisoners’ deaths. Nyiszli records that Mengele required twins under study to die at the same time so their bodies could be compared. Afterward, organs were sent to the Kaiser Wilhelm Institute for Anthropology, Human Heredity and Eugenics, directed by Otmar von Verschuer. The specimens were treated as urgent research material. This chain—from selection at the camp, through experiments and death, to the transfer of organs—shows how Mengele’s work connected the violence of Auschwitz to an academic research institution beyond it.

Nyiszli’s account also emphasizes how diligently Mengele maintained the research process. Even in autumn 1944, when Germany had already lost the war, he spent long periods in the dissection room and laboratory. He reviewed dossiers of twins and took care over their organization, including the condition of a dossier cover. The detail is revealing not because it excuses or diminishes the work, but because it shows sustained attention to records and procedure amid the camp’s mass killing. Administrative care and medical routine coexisted with the destruction of the people documented in those files.

Defense, Accountability, and Testimony

After the war, Mengele defended his actions as military and scientific duty. When his son Rolf asked what he had done at Auschwitz, Mengele described his task as protecting a biological community and eliminating those he called foreign bodies. He claimed that selection saved the maximum number of lives, invoked obedience to orders, and presented himself as one cog in a larger system. Rolf did not accept this explanation as an answer to the question. The exchange exposes the distance between Mengele’s abstract language of duty and the concrete choices he had made.

In early 1964, Mengele learned from a letter from Martha that the universities of Frankfurt and Munich had withdrawn his doctoral degrees in medicine and anthropology. The stated grounds were his violation of the Hippocratic Oath and his murders at Auschwitz. He was devastated by the loss of the qualifications he regarded as central to his identity, and he left the plantation for the jungle with his dogs. The episode shows that the work he had treated as the foundation of a scientific career was also the basis for institutional repudiation.

The survivors’ testimony at the 1985 mock trial in Jerusalem brought the experiments back into public view. Survivors who had been used in Mengele’s research testified at Yad Vashem, describing the treatment of twins and newborns and its effects on families. Their testimony, broadcast internationally, prompted renewed pressure to locate and arrest Mengele. Set beside Mengele’s self-exculpatory account, these witnesses restore what his vocabulary of selection, duty, and scientific purpose obscured: the people subjected to his authority, and the lasting consequences of the choices he made.