Professor Ludwig Boltzmann, c mid-20th century

Ludwig Boltzmann was an Austrian mathematician and theoretical physicist. He is known for the development of statistical mechanics and the explanation for the second law of thermodynamics. In 1877, he provided the current definition of entropy. He studied mathematics at the University of Vienna between 1863 to 1869. He became a full Professor of Mathematical Physics at the University of Graz. He married Henriette von Aigentler in 1876 and had four children, three daughters and one son. He further worked at the University of Munich in 1890, and University of Vienna in 1894. He was awarded as a Foreign Member of the Royal Society (ForMemRS) (London) in 1899. In 1906, due to deteriorating mental health, he resigned his position. He died by suicide on 5th September 1906, aged 62. Modern experts believe his recorded symptoms indicate he had bipolar disorder.