Mr. Semashko was born on 20 November 1949 in Kalinkovichi, Gomel Oblast, Republic of Belarus.
In 1972, he graduated from the Belarusian Polytechnic Institute.
1972-1974 military service
1974-1996 design engineer, head of design bureau No.44; chief engineer of special mechanical engineering design bureau – chief engineer of mechanical engineering department, Dzerzhinsky Plant, Research and Production Association INTEGRAL
1996-2001 general manager, Minsk Production Association Horizont – director, Minsk Plant Horizont
2001-2003 Minister of Energy of the Republic of Belarus
July – December 2003 Acting Deputy Prime Minister of the Republic of Belarus
December 2003 – present time, Deputy Prime Minister of the Republic of Belarus
State decoration: Order of Honour.
Married, 2 daughters.