Carl Linnaeus or letter D is the correct answer. He was born on May 23, 1707, in Sweden. He is a known botanist, zoologist, and physician especially in formalizing binomial nomenclature of naming organisms thus his title Father of Modern Taxonomy. Most of his higher education was held at Uppsala University where he also gave botany lectures in 1730.
He published Systema Naturae in the Netherlands between 1735 and 1738. he collected and classified a number of animals, minerals, and plants for the books he was publishing. The abbreviation L or Linn beside the species name in botany to connote that he himself studied and named it. He died on January 10, 1778, at the age of 70.