Josef Mengele—Miklós Nyiszli

Josef Mengele’s relationship with Miklós Nyiszli was a coerced medical collaboration at Auschwitz concentration camp, in which a Jewish prisoner-doctor was made to serve the research and killing apparatus directed by an SS physician. Nyiszli examined prisoners, recorded findings, and carried out work under Mengele’s orders; after surviving the camp, he documented the relationship as an eyewitness. His account sets Mengele’s claims of scientific purpose against the actual conditions of the work and the people made its subjects.

Identity and Circumstances

Nyiszli was a Hungarian physician imprisoned at Auschwitz and assigned to the Sonderkommando, whose members were forced to work in connection with the disposal of victims’ bodies. Mengele used Nyiszli’s medical training within this system. The book describes him as Mengele’s instrument: not a freely collaborating colleague, but a prisoner compelled to perform examinations and dissections at the direction of a powerful camp doctor. The professional vocabulary shared by the two men therefore conceals an extreme imbalance of power. Nyiszli could apply medical knowledge, but he did so within circumstances imposed by his captors.

Nyiszli later recorded what he had witnessed in Auschwitz: A Doctor’s Eyewitness Account, first published in Hungary in 1946 and in France in 1961. His testimony provides a sustained view of Mengele’s activities from close range: the selections on the ramp, the work in the experimental barracks and the laboratory, and the transfer of research material beyond the camp. It also preserves the distinction between Mengele’s authority to command and Nyiszli’s forced role in carrying out parts of his medical program.

Selections and Experimental Work

Mengele’s authority extended from the selection of arriving deportees to the examinations that followed. Nyiszli recounts that trains carrying Hungarian deportees arrived at a rate of four or five a day and that Mengele spent long periods at the ramp directing people onward. The selection was not separate from the work Nyiszli was made to do: those whom Mengele singled out could be sent for examination, while his decisions also exposed large numbers of people to immediate death. Nyiszli’s account makes clear that medical procedure operated inside, and served, this system of selection and extermination.

In the experimental barracks, Nyiszli was required to conduct tests on twins and people with dwarfism. The procedures included blood tests, spinal taps, and transfusions between twins; the evidence emphasizes that these were painful and exhausting experiments performed on living prisoners without freedom to consent or refuse. Mengele treated the paired subjects as research material and required that twins be killed together so their bodies could be compared. Nyiszli’s description thus records not only the tests but the logic that connected examination to death.

The relationship also linked the camp’s experiments to academic research outside it. Nyiszli records that organs were sent to Berlin, to the institute directed by Professor von Verschuer, and that shipments were marked as urgent war material to expedite their delivery. Mengele’s research was presented as service to German medicine, but the procedure depended on victims who had been imprisoned, experimented on, and killed. The scientific labels did not lessen that reality; in Nyiszli’s account, they show how institutional language could make the transfer of human remains appear routine.

Laboratory Routine and Individual Cases

Nyiszli describes Mengele returning to the dissection room even in autumn 1944, when Germany had already lost the war. He spent long periods with Nyiszli among microscopes, flasks, and test tubes, or at the laboratory table reviewing research. Their repeated proximity was not evidence of an ordinary professional partnership: Mengele set the tasks, while Nyiszli was obliged to perform them. The routine also shows Mengele’s attention to the handling of research records. On one occasion, he reproached Nyiszli over a faint grease mark on a dossier of twins, a small detail that, in the account, contrasts sharply with the violence inflicted on the people whose cases the files recorded.

One episode follows a father and his disabled son, Jewish prisoners from the Łódź ghetto whom Mengele removed from the selection line for examination by Nyiszli. Nyiszli measured them and gave them food before they were killed on Mengele’s orders. Mengele later questioned Nyiszli about the examination and post-mortem findings, then ordered that the bodies be prepared as skeletons and sent to an anthropological institute in Berlin. Nyiszli recounts that Mengele brought senior medical colleagues to inspect the skeletons; they discussed the deformities as research findings, and the remains were packed with accompanying data for shipment. The episode reveals the full chain of command and use: Mengele selected the victims, Nyiszli was forced to examine them, and the resulting material was treated as a scientific resource.

Testimony and Significance

Nyiszli’s account characterizes Mengele as outwardly cheerful yet capable of great cruelty, and emphasizes the fear his name inspired among prisoners. It also records Mengele’s sustained concentration on research amid the camp’s violence. These observations do not simply describe a private temperament. Set beside the selections, experiments, killings, and dispatch of research material, they show how the appearance of medical diligence coexisted with the deliberate destruction of those made into subjects.

The relationship is especially revealing because Nyiszli’s specialized role brought him close to Mengele’s working methods while leaving him without meaningful choice. His testimony documents specific procedures and decisions, but it also exposes the limits of the language of collaboration: the physician who performed examinations was himself a prisoner under orders. Read against Mengele’s later defense that his work served German science and that the twins owed their lives to him, Nyiszli’s record supplies a direct counterweight. It shows a research program built on coercion and killing, and a medical hierarchy in which the commander’s claims of scientific purpose did not alter the fate of the people subjected to it.