Duba wurin da ke ƙasa sannan ka amsa tambayar daga baya a cikin harshe ɗaya kamar yadda wurin yake:  Rösler an haife shi ne a Khánh Hung, lardin Ba Xuyên, a Kudancin Vietnam (yanzu lardin Sóc Trăng, Vietnam) a ranar 24 ga Fabrairu, 1973. Babu wani bayani game da iyayen haihuwar Rösler na Vietnamese da aka sani. An ɗauke shi daga gidan marayu na Roman Katolika kusa da Saigon ta hanyar wasu ma'aurata na Jamus waɗanda tuni suna da yara biyu na halitta, kuma aka kawo su Düsseldorf, Jamus ta Yamma, a cikin jirgin sama na ƙungiyar jinƙai na yara masu jinƙai na Terre des Hommes a lokacin da yake da watanni tara. Mahaifinsa wanda ya karbe shi, wanda ya kasance jami'in soja ne, bayan da ma'aurata suka rabu lokacin da yake dan shekara hudu. Rösler ya girma a Hamburg, Bückeburg da Hanover, inda ya kammala karatun sakandare a 1992. Bayan an horar da shi ya zama likitan yaƙi a cikin Bundeswehr na Jamus (Hukumar Tsaro ta Tarayya), an karɓi Rösler don yin karatun likitanci a Makarantar Likita ta Hannover. Bayan wannan, ya ci gaba da karatunsa a asibitin Bundeswehr a Hamburg. Ya sami digirin digirgir a fannin aikin tiyata na zuciya a shekara ta 2002. Ya bar aikin a matsayin Stabsarzt (ranking ga jami'an likitocin Jamus daidai yake da kyaftin din soja) a shekara ta 2003.  Tambaya: Bayan ya yi aiki a matsayin likitan likitanci, Rosler ya ci gaba da karatu a ina?
asibitin Bundeswehr da ke Hamburg