Justice Froneman was appointed as a justice of the Constitutional Court in 2009. He retired from the apex court in June 2020. Outside of legal practice and his judicial responsibilities, Justice Froneman taught at several universities. For five years, he was Professor Extraordinaire at Stellenbosch University where he gave lectures in Human Rights at LLM level. He attended Harvard and Oxford Universities in 1999 and 2008, respectively, in a visiting capacity. At present he is also an extraordinary professor at the University of Free State (UFS).