Vassi was appointed to the Nedbank Group Limited and Nedbank Limited boards as a non-executive director and Chairman designate with effect from 1 May 2015 and then as Chairman on 11 May 2015. Vassi was also appointed as a non-executive director of Old Mutual plc with effect from 1 May 2015. Previously Vassi Chief Executive of Deloitte Southern Africa from 1998 to 2006, a member of the Deloitte UK executive from 2006 to 2009 and a member of Deloitte global executive from 2007 to 2011, and thereafter Vice chairman of Deloitte UK from 2009 to 2014. Vassi is a member of the South African Institute of Chartered Accountants, with honorary life membership granted in 2011 for his contribution to the development of the profession in South Africa. He is also a member of the Institute of Chartered Accountants in England and Wales.