When was the scientist that  revealed by means of microscopy the previously unknown world of microorganisms born?
Antonie van Leeuwenhoek Antonie Philips van Leeuwenhoek ( , ] ; 24 October 1632 – 26 August 1723) was a Dutch businessman, scientist, and one of the notable representatives of the Golden Age of Dutch science and technology. A largely self-taught man in science, he is commonly known as "the Father of Microbiology", and often considered to be the first acknowledged microscopist and microbiologist. Van Leeuwenhoek is best known for his pioneering work in the field of microscopy and for his contributions toward the establishment of microbiology as a scientific discipline.
Elias Zerhouni Elias Zerhouni (Arabic: إلياس زرهوني‎ ‎ ; born April 12, 1951)is an Algerian-born American physician scientist radiologist and biomedical engineer. As a world-renowned national and international leader, Zerhouni is widely viewed as one of the leading authorities on emerging trends and issues in biomedical sciences and medical care.