Premise: The position of South African ambassador to the United States is the most prestigious and top diplomatic post in South Africa. The position was first held in March 1949, following the upgrade of South Africa's diplomatic mission to an embassy. The post has been held by many important politicians and is currently held by M. J. Mahlangu.
Hypothesis: M. J. Mahlangu, who currently holds the position of South African ambassador to the United States, has held the position for many years.