He joined the office on November 29 following a government notification, said a Petrobangla press release.
Ruhul Amin replaced former chairman Abul Mansur Md Faizullah.
Ruhul Amin, a member of the BCS (admin) cadre of 7th batch, joined the government job on February 15, 1988.
During his long career, he served the government as deputy commissioner of Pirojpur and divisional commissioner of Chattogram division. He also served as the director (admin) of Petrobangla.
Besides, he served different ministries in various capacities.
A Dhaka University social science graduate, Ruhul Amin is now engaged in research work at Archeology Department of Jahangirnagar University as a part-time researcher for his doctorate degree, the release added.