1881- He was born on the 6th day of August of this year in at Lochfield near Darvel in Ayrshire, Scotland. He attended Louden Moor School, Darvel School, and Kilmarnock Academy before moving to London where he attended the Polytechnic.
1901 – His older brother, Tom, was already a physician and suggested to his younger sibling that he follow the same career, and so in this year, the younger Alexander enrolled at St Mary’s Hospital, London.
1906 – He qualified with distinction in this year and began research at St. Mary’s under Sir Almroth Wright, a pioneer in vaccine therapy.
1908 – He gained M.B. and then B.Sc. with Gold Medal in this year, and became a lecturer at St. Mary’s until 1914.
1915 – He wedded Sarah Marion McElroy of Killala, Ireland, who died in 1949. Their son became a general medical practitioner.
1918 – He returned to St.Mary’s Hospital, which was a teaching hospital.
1922 – His best-known achievements are the discovery of the enzyme lysozyme in this year.
1928 – This year, he was elected Professor of Bacteriology at the School.
1943 – He was elected Fellow of the Royal Society in this year and knighted in 1944.
1948 – He was voted as Emeritus Professor of Bacteriology, University of London in this year.
1953 – After Sarah’s death, Fleming married Dr. Amalia Koutsouri-Voureka, a Greek colleague at St. Mary’s in 1953.
1955 – Fleming died of a heart attack on the 11th day of March of this year in London. He was buried in St. Paul’s Cathedral. His discovery of penicillin had changed the world of modern medicine by introducing the age of useful antibiotics; penicillin has saved, and is still saving, millions of people.