[4] In 1970, he completed special school of Militsia named after N. Rzayev in Baku and graduated from Academy of Internal Affairs of USSR in 1980.

In 1980-1984, he served as the deputy chief of Internal Affairs Department of Nagorno Karabakh Autonomous Oblast of Azerbaijan.

In 1987, Usubov was appointed Minister of Internal Affairs of Nakhichevan and from 1989 up until 1993, worked as the Chief of Criminal Investigation, Head of Department of Visas and Registration (OVIR) and Chief of Human Resources of Ministry of Internal Affairs of Azerbaijan.

[5] In 2009, he filed a libel suit against activist Leyla Yunus after she alleged that police officers had been involved in human trafficking of young girls.

[8] By order of President Ilham Aliyev, on June 20, 2019, Usubov was appointed Secretary of the Security Council.