Mary Ma, who played a key role in Lenovo’s acquisition of IBM’s personal computer division two years ago, has joined buyout firm TPG.

Ma retired as Lenovo’s chief financial officer in May. She was named as non-executive vice chairman of the PC manufacturer, which has its headquarters in the Triangle.

At TPG, Ma will serve as partner and managing director. She has been ranked as one of the most powerful women in the world by Forbes magazine.

TPG was one of the financers of Lenovo’s $1.75 billion deal with IBM.