Kovalevsky worked at the scientific production association "Energy" (Korolev, Moscow region).
From February 1996 to May 1997 he served as a flight surgeon for NASA personnel deployed to the Yuri Gagarin Cosmonauts Training Center, Star City, Russia, followed by work in the Center for Flight Control in Korolyov, Russia, in support of the NASA Expedition 4 to the Mir Space Station.
Moscow metropolitan area includes the city of Moscow, a ring of cities annexed to it and administered within (Balashikha, Korolyov, Krasnogorsk, Khimki, Mytishchi and Zelenograd), as well as large nearby towns with population of over 100,000 citizens (Reutov, Zheleznodorozhny, Podolsk and Lubertsy, to name a few) that fall under regional administration.