He was selected to teach at the Islaamic University of Madeenah by the former Mufti of Saudi Arabia; al ‘Allaamah Muhammad ibn Ibraheem, may Allaah have mercy upon him, and he was the first person to lecture at the University.
He was chosen to be the vice president of the Islaamic University of Madeenah by King Faysal, may Allaah have mercy upon him, in 1393 H.
He became the President of the Islaamic University of Madeenah in 1395 H after its President; the former Mufti, al ‘Allaamah ibn Baaz , may Allaah have mercy upon him, left, and he remained in that postion until 1399 H.
He currently lectures in the Faculty of Sharee’ah in the Islaamic University as well as the Prophetic Masjid of Madeenah.
A more complete biography of the Shaykh can be found here and here
A complete biography in Arabic can be found here