Gus Attridge co-founded pharmaceutical maker Aspen Pharmacare with CEO Stephen Saad (also a member of Forbes list of Africa’s Richest) in 1997. The Deputy CEO, Attridge owns a 4% stake in the publicly traded South African firm. Aspen Pharmacare bills itself as the world’s fifth largest generic drugmaker. It expanded its global footprint with a slew of acquisitions in 2013. Aspen manufactures drugs in factories around the world, including in Australia, Brazil, Mexico, Germany, South Africa and Tanzania.