Responsible investment at Old Mutual : a case of institutional entrepreneurship / Stephanie Giamporcaro (Graduate School of Business, University of Cape Town, Western Cape, South Africa, and Department of Accounting and Finance, Nottingham Business School, Nottingham Trent University, Nottingham, UK) (Graduate School of Business, University of Cape Town, Western Cape, South Africa, and Department of Accounting and Finance, Nottingham Business School, Nottingham Trent University, Nottingham, UK), and David Leslie (Graduate School of Business, University of Cape Town, Cape Town, Western Cape, South Africa).