Datin Mariam Mahmun, aged 46, joined Suria Capital Holdings Berhad as the Corporate Affairs Manager in June 2005. She was then promoted to the post of Senior Manager (Corporate Affairs) in June 2008. She is a graduate from the University of Canterbury at Kent, England holding a B.A (Hons) degree in Development Studies (Economics). Her working career started in the State's civil service where in 1984 she joined the Human Resource Development Bureau or Biro Pembangunan Sumber Manusia (currently known as Human Resource Development Department) of the Chief Minister's Department.
In 1994, she joined Sabah Development Bank Berhad, serving the training and research units. She left after 10 years of service with the Bank to join Suria.