Adolf Samuel Ostreicher, mechanical engineer, was the son of Ignatz Ostreicher and his wife Rosa, born Weiss. In September 1899, residing at Wickham Market, Suffolk, England, he was admitted to British nationality. He came to the Transvaal Colony in or before 1905, for in that year he was elected a member of the Transvaal Institute of Mechanical Engineers. During the next few years he participated actively in its proceedings and contributed four papers to its Journal, dealing with "Reheating of air" and "Modern German winding plants" (1906/7, Vol. 5), "Lines of influence for the determination of stresses in structures" and "The conducting resistance of compressed air" (1907/8, Vol. 6). In 1910 the institute amalgamated with the South African Association of Engineers to form the South African Institution of Engineers. Ostreicher contributed a paper on "The manufacture of turbines as a future industry" to the Transactions of the latter (1913, Vol. 1, pp. 295-301).
Ostreicher subsequently worked as an engineer in Berlin-Lankwitz, Germany, where he remained for the rest of his life. He was married to Francisca Walpurga, born Muennich (died 1911), with whom he had a daughter.