As a journalist, Assegaff was managing editor of the crusading Indonesia Raya daily; chief editor of the Suara Karya, the then-paper of the Golkar Party; deputy managing director of the state-funded Antara news agency; chief editor of the Warta Ekonomi business weekly magazine; and chief editor of Media Indonesia, politician Surya Paloh's paper.
As an educator, Assegaff taught classes on journalism in Indonesia and the history of mass media at the University of Indonesia, where he chaired the journalism department.
book Reader on the History of the Mass Media was required reading.
His fervor to enhance professionalism in the newsroom led him to co-found the Dr. Soetomo Press Institute (LPDS) in 1988.
He was institute's first director until he left for Hanoi.
In politics, Assegaff
joined the NasDem Party
as chair of the fledgling party's patron board.
The party was founded by media magnate Surya Paloh as his vehicle for running for president in 2014.