Susie joined the Internet Watch Foundation in September 2011 as Chief Executive and is a Director of the UK Safer Internet Centre.
Mr Ray-Hill will lead the IWF through a period of transition and growth while a national recruitment campaign takes place for the permanent CEO.
Heidi Kempster joined the IWF in June 2013 and is the Deputy CEO and Chief Operating Officer. She is responsible for all financial affairs of the IWF and for ensuring the future sustainability of the organisation.