He has served as lecturer/Tutor at his alma mater in London & Fourah Bay College, University of Sierra Leone,and worked as Executive Chemist at National Petroleum in Sierra Leone.

He has served as Minister in various Ministries namely Mines and Mineral Resources, Internal Affairs and National Security, and Transport and Communications. At the communications ministry, he transformed the industry from Public to Private ownership and from Monopoly to Competition.. During his tenure, he created the regulatory body, National Telecommunications Commission, NATCOM. Before the birth of NATCOM, Dr.Harding successfully regulated the telecoms industry for several years with resounding success on affordability, choice and efficiency.

Dr.Harding has served as Member of National Defence Council and Chairman of the then National Power Authority.

On the political Front, he has served the SLPP as National Secretary-General, where he led a team to win two Presidential/Parliamentary elections (1996 and 2002) and the local elections (2004) when 16 local councils out of 19 were controlled by the SLPP. He has also acted as Deputy National Chairman and leader and is the current National Chairman and leader of the SLPP under whose Leadership the SLPP has taken the reins of power with Rtd. Brig. Julius Maada Bio emerging as President of Sierra Leone.