 The college and its alumni have played a very important role in feminism.Somervillians include prime ministers Margaret Thatcher and Indira Gandhi, Nobel-Prize-winning scientist Dorothy Hodgkin, journalist Esther Rantzen, reformer Cornelia Sorabji, writers Marjorie Boulton, Vera Brittain, A. S. Byatt, Susan Cooper, Penelope Fitzgerald, Winifred Holtby, Nicole Krauss, Iris Murdoch and Dorothy L. Sayers, politicians Shirley Williams, Margaret Jay and Sam Gyimah, Princess Bamba Sutherland and her sister, philosophers Philippa Foot, Mary Midgley and Onora O'Neill, archaeologist Kathleen Kenyon, actress Moon Moon Sen, soprano Emma Kirkby and numerous (women's rights) activists.Somerville educated at least twenty-eight dames, sixteen heads of Oxford colleges, eleven life peers, ten MP's, four Olympic rowers, three of "The 50 greatest British writers since 1945", two prime ministers, two princesses, a queen consort and a Nobel laureate.