Otto Weininger (April 3, 1880 – October 4, 1903) was an Austrian philosopher. In 1903, he published the book Geschlecht und Charakter (Sex and Character) which gained popularity after his suicide at the age of 23. Today, the book is generally viewed as misogynistic and antisemitic in academic circles; however, it continues to be held up as a great work of lasting genius and spiritual wisdom by others.