Career
He served with the Royal Malaysian Police for 41 years. He took over the post from Mohamed Bakri Omar in September 2006. Hassan had previously worked as Deputy Inspector-General under him.
Two months later, it was announced that he would receive a two-year extension of his term to 13 September 2009, despite having reached the mandatory retirement age.
In March 2010, Home Minister Datuk Seri Hishammuddin Hussein said that the government will find a replacement for Inspector General of Police Musa Hassan shortly. Finally, on 13 September 2010 Musa resigned as after serving for more than 3 years.
Subsequently, his deputy, Tan Sri Ismail Omar, was promoted to be the new Inspector-General. On the 29th of April, Musa was appointed as Pepakatan Rakyat"s security advisor.
He received his education in Kuala Lumpur, and has two younger brothers: Dato" Fuad Hassan, a politician, and Dato" Jalaluddin Hassan, an actor.
He was an old boy of Bukit Bintang Boys" Secondary School.