[2] He took over the post from Mohd Bakri Omar in September 2006; Hassan had previously worked as Deputy Inspector-General under him.

[4] Two months later, it was announced that he would receive a two-year extension of his term to 13 September 2008, despite having reached the mandatory retirement age.

[2] 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.

On 23 September 2023, Musa Hassan tied the knot with Qistina Lim at a ceremony held in Shah Alam.

Previously, he married Elly Afizahwati Abdul Jalil for 10 years before she filed for a divorce.