Since graduating MEPhI 1969, worked in Kurchatov Institute researching nuclear physics.

[1][2] Following the dismissal of the whole cabinet in February 2004 by the President Putin, the Ministry was reorganized into a Federal Agency on Atomic Energy where Alexander Rumyantsev was appointed as the CEO.

[3] He stepped down from this post in November 2005 during the international scandal[4] involving his predecessor as a Minister, Yevgeny Adamov.

In preparation for his next job Alexander Rumyantsev graduated the Higher Diplomatic Courses of the Diplomatic Academy of the Russian MFA in 2006, and was posted as the Russian ambassador to the Republic of Finland.

[5] Later he was awarded the diplomatic rank of the Ambassador Extraordinary and Plenipotentiary of the Russian Federation in April 2008.