Oos has been a SACMA member since 2010 and was elected as SACMA President for 2019.
He holds a B.Eng (Industrial and a B.Eng (Mining Hons) from the University of Pretoria , as well as an MBA from the University of Stellenbosch.
His career in the industry started off with an Iscor bursary to study Industrial Engineering and he soon joined Durnacol and Tshikondeni underground Mines, working his way up from miner, shiftboss, MO to Production Manager.
His career took him to Tavistock UG mine to the Assistant General Manager position at Southstock, iMpunzi and Goedgevonden Mines.
He is currently holding the position of General Manager at Goedgevonden.
Oos (short for Oosterwaldt) is married to Suzanne and they have two adult children. He is also an avid Sharks supporter.