My deepest condolences for your loss, it truly is heart breaking news. I was fortunate enough to have the pleasure of working with Stef for over 7 years; throughout he was always a trusted colleague and a highly professional individual – standards which he set himself and expected of others in return. My lasting memory of Stef will always be how softly spoken he was for such a giant of a man – almost unnerving at first experience, however Stef took great care to make everyone he dealt with feel at ease through his contagious humour and warm smile. NATS was very lucky to benefit from Stef’s experience and insight in the specialised area of commercial Procedure Design, an area he had a total passion for; he was clearly a world class expert and thrived on the technical challenges he was often presented with. Stef will be truly missed. My thoughts and prayers with you all. Rest in peace big man. Pauly Carroll