Born on 14 August 1952,[1] Sibanyoni began his legal career in 1974 as a clerk and interpreter at Witbank Magistrate's Court.
In addition, from 1993 to 1995, he lectured law students at Vista University in Mamelodi, where he was director of the legal aid clinic.
[1] In August 2008, following an investigation arising from a complaint by opposition MP Willem Doman, the Public Protector, Lawrence Mushwana, recommended that the Speaker of the National Assembly should take action against Sibanyoni on the basis that he had received an unlawful and irregular donation of R25,856 from officials of the Kungwini Local Municipality.
[3] In the next general election in 2009, Sibanyoni was not initially re-elected, but he returned shortly into the legislative term, on 23 June 2009, to fill a seat in the Gauteng caucus that had been vacated by Oupa Monareng.
[8] His appointment as a part-time commissioner was formalised by President Jacob Zuma and took effect on 3 January 2017 for a period of seven years.