Sergei Todorov Nikolchev was born on 10.01.1896 in the village of Zheravna, Sliven. He studied in Varna and then started work in the post office, on the telegraph. He became leader of the trade union organisation of the post workers.
He took part in World War One, on Dobroudzha front. He was an active trade union activist after the war. He had been member of BCP since 1918. In 1919 he was member of the strike committee of the big railway strike. He was sentenced to three years in prison. He took part in the preparations for the September uprising. From 1920 he became responsible for the Anti-Military Department. In the April events he was arrested and sentenced to death. He came out of prison in 1932 and worked in the trade unions in Sofia. In 1934 he was interned in Aitos, in 1941 - in Popovo. After 9.09.1944, till 1951 he was Head of Varna Telegraph & Post Office. From 1951 to 1956 he was chairman of Varna People's Council /Mayor/ of Varna. From 1956 till his retirement he was head of Radio Varna. He was long years chairman of the City Committee for Peace.
He died on 17.06.1974.