Sergey Iliodorovich graduated from Tsarskoye Selo Lyceum in 1880.
After graduated from Tsarskoye Selo Lyceum, Sergei Iliodorovich settled on his estate, where he devoted himself to agriculture and social activities.
Sergei Iliodorovich was elected as the representative with the casting vote of the Valuysk district and Voronezh provincial assemblies and an Honorary Magistrate. Since 1891 he has been an official of special assignments in the Ministry of Internal Affairs.
Sergei Iliodorovich supervised the population census in Kharkiv and Poltava provinces in 1897. He was the director of the Department of agriculture of the Main Department of Land Management and Agriculture during 1905-1906. He was the deputy of the third and fourth State Duma from the Voronezh province as well.
Then Sergei Iliodorovich was appointed as the chairman of the Land Commission of the fouth State Duma. Since August 1917 he was a representative of the State Duma in the Local Council of the Russian Orthodox Church.
In 1920 Sergei Iliodorovich emigrated to Estonia, where he served in the Ministry of Justice. He died on July 7, 1922 in Tallinn, Estonia.
Sergei Iliodorovich was married and had five children.