Ponomaryov graduated from the Leningrad Senior Party School of the Communist Party of the Soviet Union in 1979, and served as the second secretary of the Petrozavodsk October District Committee, the counselor of the Soviet Embassy in Afghanistan, and the first secretary of the Petrozavodsk Lenin District Committee.
Ponomaryov graduated from the Department of Economics of Petrozavodsk State University in 1995 and served as the General Manager of Pitkyaranta Paper Company.
Ponomaryov served as a member of the Federation Council from 28 December 2001 to 1 January 2003. From 2003 to 2004, he served as Deputy Prime Minister of the Government of the Republic of Karelia. In his later years, he served as chairman of the Karelian Entrepreneurs Association.