Davis leaves Phumelela at the end of September 2015 after seven years with Phumelela and starts his new job in October.
A press release from CEO Rian du Plessis said: “He will be sorely missed not only by Phumelela but by the racing community in South Africa.”
Davis said: “It’s been the toughest decision I’ve had to make – made tougher by all the people I’ve worked with here. I wasn’t looking for anything. This opportunity came out of the blue and ultimately was too good to pass by, even though the timing is not great on a personal level.
“I’m very grateful to my fellow executives and the board’s confidence in me which I’m sure has paved the way for this opportunity.”
His replacement will be announced in due course.