In 1983 he completed seven years of piano study, taught by Irma Georgievna Paruhova.

From January 1997 to July 1998, he worked as a press manager of operation Concert Hall (now the Academic) of the Russian Academy of Sciences.

From December 1998 to April 2000 he was a correspondent for the weekly Wednesday of ZAO Concern Vechernyaya Moskva.

Later, as an invited expert Sosedov participated in the religious TV program Canon on TV-6.

In September 2010 he was one of four judges on the singing show X Factor on the Ukrainian TV channel STB.