Gregor Johann Mendel was born in Heinzendorf bei Odrau, Austrian Silesia, Austrian Empire in 20 July 1822. He was an Austrian Triat and Scientist. He founded new science for genetics for his study of the inheritance of some certain traits in pea plants, follows particular laws. But his work was recognized after turn of 20th century.
Hmm, better read more about him in Wikipedia
And this is the doodle of His birthday.