[1][2] She practiced as an advocate in the North West Bar from 1991 until 1997, when she took up a post as a law lecturer at the University of Bophuthatswana.
[3] In 1999, Leeuw was appointed as a judge in the North West High Court (then still named after Bophuthatswana).
[1] In November 2007, President Thabo Mbeki appointed her permanently as a judge of the Labour Appeal Court.
[4] She was the first woman to be appointed as Judge President in any division of the High Court of South Africa.
[9] She wrote the court's unanimous judgement in Stratford and Others v Investec Bank Limited and Others, handed down in December 2014.