Mrs Shephard also announced that because of other commitments Shailendra Adwalpalkar has stepped down from the board.
The appointees are Linda Wedgbury and Rodney East.
'The agency is now in its third year of operation and has firmly established itself as a major player in the education world,' Mrs Shephard said.
'I would like to pay tribute to Shailendra Adwalpalkar for the very valuable contribution that he has made to the early life of the agency. I would particularly like to thank him for his valuable work as chairman of the agency's audit committee. I wish him well for the future.'