Josef Mengele—Hans Sedlmeier

Hans Sedlmeier’s relationship with Josef Mengele was a decades-long channel of trust, money, information, and practical assistance. A childhood friend of Mengele and confidant of his industrialist father, Sedlmeier became one of the fugitive’s most dependable intermediaries. He helped safeguard the scientific papers Mengele carried from Europe, kept him connected to his family, and repeatedly supported his efforts to evade arrest. Their association endured even as the work exhausted Sedlmeier and, eventually, his disclosures helped investigators uncover the support network.

Friendship and the Scientific Case

In the confusion of 1945, Mengele entrusted a briefcase containing notebooks, anatomical drawings, blood samples, and cell fragments to a sympathetic nurse in the Soviet zone of Germany. After retrieving it, he passed it to Sedlmeier, who kept it safe while Mengele hid for three years near a farm. They met regularly in the surrounding woods. The case mattered both as the record of Mengele’s research and as a dangerous piece of evidence: possession of it could have exposed him to the Soviets. When Mengele was preparing to leave Europe, Sedlmeier returned the briefcase before his departure from Italy, with a large envelope of cash inside. Their friendship had already become a clandestine working relationship, with Sedlmeier protecting both a personal confidence and material that Mengele considered indispensable.

After Mengele reached Argentina in 1949, Sedlmeier helped maintain his connection to Germany. Mengele, then using the name Gregor, avoided speaking German in public and lived cautiously, but he continued to exchange correspondence with his wife, Irene Mengele, and the family. He collected post sent to him at the Hotel Palermo through poste restante; Sedlmeier forwarded letters and instructions from his parents in return. Their channel allowed family news to reach a man who could not safely approach German speakers or communicate openly. The letters also carried the contrast between Mengele’s uncertain, solitary existence and the flourishing family business his father described from home.

Practical Support and Flight from Argentina

Sedlmeier’s help took more direct form as Mengele moved through South America and Europe. In 1956, he waited for Mengele at the Geneva airport and drove him to Engelberg, where Mengele reunited with his family. Later that year, after a minor car collision in Munich led police to question his Argentine papers and identity, Sedlmeier joined an urgent delegation to police headquarters. He arrived with Karl Mengele, the family lawyer, and the chief of police of Günzburg; the group negotiated with the reporting officer and resolved the immediate crisis. Mengele flew back to South America the next day. Sedlmeier’s presence connected the fugitive’s family and local influence to a moment when an ordinary traffic incident threatened to expose him.

The danger became more acute in 1959. Hermann Langbein had gathered evidence and pressed for Mengele’s prosecution. A regional court in Freiburg im Breisgau issued an arrest warrant on 25 February for multiple cases of premeditated murder and attempted murder, and extradition requests were expected to follow. Sedlmeier received news of the warrant from a police informant and sent Mengele a telegram. The warning prompted a hurried departure: Mengele sold property and shares, closed accounts, and fled to Paraguay. Sedlmeier’s message gave him time to act before the legal pressure could catch up with him. The episode shows how the same communication networks that sustained their friendship could also function as an early-warning system.

In the years that followed, Sedlmeier continued to bridge the distance between Mengele and his relatives. He carried news about Irene and Rolf, and later about Martha Mengele and Karl-Heinz, while advising that correspondence had become too dangerous. By 1964, the channels required increasing caution. Mengele used initials in letters to Germany; sealed mail went to a post-office box in Switzerland or, less often, to a family friend in Augsburg, where Sedlmeier retrieved and forwarded it. Correspondence reaching Brazil went to a post-office box in Gerhard’s name. The precautions were not theoretical: in the middle of 1964, Fritz Bauer obtained a warrant to search Sedlmeier’s home, suspecting that he was the intermediary between Mengele and his family. Police found no letters or compromising evidence. Sedlmeier had received warning of the impending raid through a police contact, allowing the channel to escape discovery that time.

A Durable Network, and Its Cost

Sedlmeier’s position extended beyond carrying messages. He was part of the small circle through which Mengele discussed money, communication, and business arrangements. In 1960, he joined Mengele and Martha in Paraguay as they discussed finances, methods of staying in touch, and the development of a subsidiary company. He also remained a link between Mengele and relatives in Germany as the fugitive’s security needs grew. The relationship thus depended on repeated acts of coordination: keeping news moving, managing practical arrangements, and preventing ordinary contact from becoming a traceable trail.

The effort weighed increasingly on Sedlmeier. Mengele’s supporters faced suspicion and surveillance, while his repeated complaints and demands strained the people still willing to assist him. Sedlmeier became tired of travelling back and forth to Brazil, of the continuing quarrels with the Stammers, and of Mengele’s lack of gratitude. Yet he continued to help. In 1971, when testifying under oath before an investigating judge, Sedlmeier denied that Mengele had any relationship with his family, had ever worked for the family company, or was known to him beyond a supposed chance encounter at Buenos Aires airport. The denials protected the family’s interests as well as Mengele: the company had grown into a multinational with more than two thousand employees, and public proof of its ties to the fugitive threatened its reputation and business.

In 1975, Sedlmeier again persuaded an unwilling intermediary to help. Gerhard needed to return to Brazil to renew his identity card under changed regulations, but resented Mengele’s past refusals to provide money for his family and business. Sedlmeier took him to Braunau am Inn, where they had lunch and visited the house in which Adolf Hitler was born. During the visit, Sedlmeier laid out a plan for Gerhard to renew the card in Brazil, presenting the task as a service to Mengele. Gerhard went to São Paulo in early 1976 and helped arrange the replacement identity document. The episode reveals Sedlmeier’s persistence and his skill at mobilizing loyalties even when the people involved had reasons to refuse.

Exposure and the End of the Arrangement

By the early 1980s, Sedlmeier’s role had become difficult to sustain. He was weary of the constant travel and of the years of grievances and concealment, but the family’s support did not simply end. In autumn 1984, during a holiday dinner in the Black Forest, he let slip to a friend that he had never stopped sending money to Mengele. The friend spoke to the police. The disclosure set in motion a search that the family’s local police connections did not prevent: this time, the Günzburg police did not warn Sedlmeier in advance.

At the end of May 1985, police searched Sedlmeier’s villa. In his wife’s dressing room they found an address book, coded telephone numbers, and photocopies of correspondence involving Mengele, Wolfram Bossert, and the Stammers. One of Bossert’s letters announced Mengele’s death. Sedlmeier refused to cooperate and was placed under house arrest while investigators decoded the address book and followed its leads to Brazil. The materials helped connect the European and South American parts of the support network, even though the initial surveillance in Brazil found no sign of Mengele.

The relationship’s final public reckoning came when the evidence about the family’s assistance could no longer be kept private. Rolf later confirmed that his father had died in Brazil in 1979 and said the death had been concealed out of consideration for those who helped him. A magazine report disclosed that the family had known where Mengele was hiding and supported him financially to the end. Sedlmeier, along with other relatives and associates, maintained silence. For years he had served as custodian, courier, warning system, and advocate; the eventual discovery of his records and the exposure of his financial support showed how much Mengele’s survival had depended on that continuing personal network.