Photo: Face of the familiar television maths teacher, William Smith.
William Smith is the award winning Maths teacher who helped many South Africans get through high school maths.
Smith produced the world's first live interactive TV education broadcasts back in 1990, learners would phone in and take part in their maths and science problems being solved while they watched the Liberty Life Learning Channel on their screens. Students were able to get support learning materials from The Sowetan.
Smith's work is highly respected and he was awarded the Impumelelo Gold Award for innovation in 2005, he was also voted as one of South Africa's top three presenters in 1998.
In 2008, Smith sold his business venture, The Featherbed Company, an innovative tourist destination on the Knysna Lagoon that includes a nature reserve, cruise boat and a restaurant on the water. After selling the company Smith settled into retirement in Knysna.
Xolani caught up with the old Maths teacher to find out what he's been up to: