Ludwig Boltzmann
In 1872, he met Henriette von Aigentler, a math and physics teacher in Graz. In 1876, they got married and had three daughters and two sons. Boltzmann returned to Graz as head of the Department of Physics. About 14 years in Graz, he developed his concept of natural statistics. In 1885 he became a member of the Imperial Austrian Academy of Sciences and in 1887 he became President of the University of Graz.