Full Name: Sir Alexander Fleming; Profession: Scottish bacteriologist, physician-scientist, and microbiologist; discoverer of penicillin and Nobel Prize laureate in Physiology or Medicine. Nationality: Scottish (British); Born: 6 August 1881; Birthplace: Lochfield Farm near Darvel, Ayrshire, Scotland; Generation: Missionary Generation (1860–1882 idealist cohort); Chinese Zodiac: Metal Snake; Zodiac Sign: Leo; Age in 2026: 145 years old (hypothetical age if alive on 6 August 2026). Marital Status: Married twice, first to Irish nurse Sarah Marion “Sareen” McElroy in 1915 until her death in 1949, then to Greek physician Dr Amalia Voureka in 1953, remaining married to her at the time of his death. Children: one son, Robert Fleming, born in 1924; Cause of Death: died in London, England, on 11 March 1955 from coronary thrombosis (heart attack). Description: Scottish farm boy turned pioneering bacteriologist whose upbringing on an 800‑acre farm in Ayrshire and medical training at St. Mary’s Hospital in London shaped a career marked by meticulous laboratory work and service as a physician during World War I, and whose famous 1928 observation of a Penicillium mold contaminating a staphylococcal culture led him to identify penicillin’s powerful antibacterial properties, a breakthrough that, once purified, tested, and mass‑produced by Howard Florey, Ernst Chain, and colleagues, inaugurated the antibiotic era, transformed the treatment of previously often‑fatal infections such as sepsis, pneumonia, and syphilis, saved countless lives worldwide, earned him knighthood and the 1945 Nobel Prize in Physiology or Medicine, and secured his status as one of the most influential medical scientists of the twentieth century, with earlier work on lysozyme, a reputation for careful experimentation and openness to chance findings, and a legacy that continues to underpin modern clinical practice and public health.