Who is the current chairman of Commonwealth?
The United Kingdom's Prime Minister Theresa May is the current Commonwealth Chair-in-Office. The Chair-in-Office is the leader of the Commonwealth country that hosts a Commonwealth Heads of Government Meeting (CHOGM). The two-year role comes into effect at the start of the CHOGM.

Does South Africa belong to the British Commonwealth of Nations?
Known as the "British Commonwealth", the original members were the United Kingdom, Canada, Australia, New Zealand, South Africa, Irish Free State, and Newfoundland, although Australia and New Zealand did not adopt the statute until 1942 and 1947 respectively.

Who is the current secretary general of Commonwealth?
The secretary-general is elected by the Heads of Government at the Commonwealth Heads of Government meetings for terms of four years; previously, until 2000, a term was five years. The current Secretary-General is Dominica's Patricia Scotland, who replaced Kamalesh Sharma as Secretary-General on 1 April 2016.