Dr Friedrich Joseph Haass (, Fyodor Petrovich Gaaz; August 10, 1780 in Bad Münstereifel – August 16, 1853 in Moscow) was the "holy doctor of Moscow." As a member of Moscow's governmental prison committee, he spent 25 years until the end of his life to humanize the penal system. During the last nine years before his death he spent all of his assets to run a hospital for homeless people. 20,000 people attended his funeral at the Vvedenskoye Cemetery.
Koni, Anatolij Fedorovic: Doktor Friedrich Haass. Lebensskizze eines deutschen Philanthropen in Rußland, in: Zur Geschichte des russischen Gefängniswesens im 19. Jahrhundert, auf Veranlassung von Graf Gregor Stroganoff aus dem Russischen ins Deutsche übersetzt, Verlag von Duncker & Humboldt, Leipzig 1899.