Krikalev
Soon after Krikalev started working at a Russian company called NPO Energia. The company provided and designed services for the Soviet Union’s space program.
Source: russianspaceweb.com
Krikalev was not only working in mission control, but he also developed space travel protocols and equipment. In addition, Krikalev was part of the team trying to salvage Salyut 7 space station in 1985, after the systems failed.