Siddique joined the University of Dhaka in 1980, and his teaching career spans about four decades. Siddique was a chairman of the
Bangladesh Sangbad Sangstha and member of the governing body of the
Press Institute of Bangladesh. He called on diplomatic ties between Bangladesh and Pakistan to be severed for allegedly interfering in the trial of war criminals from the
Bangladesh Liberation War. His car was attacked in 2016 by activists of
Bangladesh Chhatra League after the university published a souvenir book on the 95th anniversary of the University which called
Ziaur Rahman the first President of Bangladesh. He oversaw the attachment of seven colleges to the University of Dhaka. Siddique served as the vice-chancellor until August, who was appointed by the government of Bangladesh, 2017 and was the longest-serving vice-chancellor of the University of Dhaka. He was a member of the search committee that selected his replacement. He was succeeded by
Mohammed Akhtaruzzaman who was appointed by the government of Bangladesh, ignoring the search committee formed by the University senate. He returned to teaching at the Department of Mass Communication and Journalism. He retired from active teaching in 2020. On 15 July 2020, Siddique was appointed the chairman of the board of directors of
Bangladesh Sangbad Sangstha (BSS). Siddique was the president of the board of trustees of the
Bangladesh National Museum. == Death ==