She was a member of Hong Kong's Legislative and Executive Councils, served as chairwoman of the Medical Council and of the English Schools Foundation (until her resignation from the latter in March 2011 for personal reasons, including the arrival of her first grandchild), as president of the World Psychiatric Association, and as an advisor to the United Nations and the World Health Organization.
Leslie Cheung suffered from severe depression and sought treatment from Professor Lieh-Mak for almost a year.
Despite her treatment effort Leslie Cheung finally killed himself by leaping off from the 24th floor of the Mandarin Oriental hotel, located in the Central district of Hong Kong Island, citing depression as the cause.
Felice Lieh-Mak was involved in a case of failure to take proper steps to ensure complete removal of medical equipment which allegedly resulted in suicide of one of her patients after suffering from years of unbearable pain.
When confronted by the patient, Lieh-Mak maintained that the needle used in the electroconvulsive therapy, a common procedure practised in psychiatry, was put in and removed by a technician and that she had no responsibility for the mishap.