Tyzenhauz studied at the
Jesuit College of Vilnius. As a young man, he served for the powerful
Czartoryski family in their court at
Wołczyn. At that time, Tyzenhauz befriended
Stanisław August Poniatowski, who was born and educated at Wołczyn, as Czartoryskis were his uncles. After the election of Poniatowski to the throne of Poland–Lithuania (1764), Tyzenhauz became Court Treasurer of the Grand Duchy of Lithuania, the
Starosta of
Hrodna, and administrator of royal estates. He was elected to the
Sejm of the Polish–Lithuanian Commonwealth in 1766. Tyzenhauz was in charge of all matters related to the land possessions of the King of Poland and exercised considerable freedom in their management. This freedom was further strengthened when he became
lessee of the estates in 1777. Tyzenhaus energetically but somewhat hastily began numerous endeavours in agriculture, industry, and culture, mostly situated around Hrodna. In
Šiauliai he attempted to create royal
folwarks by taking land from
serfs, demanding two days of
corvée, increasing rent payment in cash, and adding additional duties (such as road building). Such reforms tripled Tyzenhaus' income but caused a violent peasant revolt in 1769. The rebellion was quickly suppressed; the reforms were only slightly modified. Using the additional income, Tyzenhaus rebuilt Šiauliai according to the principles of
Classicism. Similar reconstruction was planned in
Joniškis. He set up at least 23 factories, that employed around 3000 workers and produced textile, paper, jewellery, tools, furniture, carriages. They used
forced labor of the local peasant population. Inspired by the
Age of Enlightenment he also opened schools for midwives, physicians, veterinarians, accountants, engineers, even ballet dancers. He also established a botanical garden, theatre, ballet, orchestra and a publishing house. He published the weekly
Gazeta Grodzieńska from 1775 to 1783. In Hrodna, his main residence and centre of his economic initiatives, Tyzenhaus built 85 structures and planned an entire borough, named Horodnica (derived from
craftsmanship). In order to finance all the different enterprises, which were often poorly supervised, Tyzenhaus needed to borrow vast amounts of money. He relied on the expensive expertise of educated foreign industrialists; efforts to build a local class of workmen were hampered by the poor education system and
serfdom. Tyzenhaus ' influence on the King and attempts to manipulate the lesser nobility raised political opposition among other nobles. After a few failures of his factories, in 1780 nobles brought charges that Tyzenhaus used treasury money for his private affairs. The case against Tyzenhaus was arranged by
Otto Magnus von Stackelberg, the Russian ambassador in Warsaw. Tyzenhaus was relieved of his duties by Poniatowski; his privileges were revoked and his property was confiscated. Disgraced, Tyzenhaus died in 1785 in Warsaw. ==Legacy==