Mr Gie was brought up in Natal, S. Africa, and he underwent his undergraduate  medical education at Grootte Schuur Hospital in Cape Town before returning to Natal for his post graduate training.. He moved with his family to Exeter in 1985 where he was employed firstly in a training registrar position and then as a hip research fellow under the supervision of Professor Robin Ling.. He has continued with his clinical and research interest in the Exeter Hip that he developed during the Fellowship. Along with Professor Ling, he invented the technique of Impaction Femoral Bone Graft for use in Revision Hip Surgery. This technique has revolutionised the lives of many patients.

His higher surgical training was completed in the South West of England and during the latter stages of this he was awarded the John Charnley Research Fellowship, studying at the University Hospital in Nijmegen, The Netherlands.

Mr Gie was appointed as a Consultant at the Princess Elizabeth Orthopaedic Hospital in 1991 and his clinical practice is now confined to adult hip surgery with a particular interest in total hip replacement and revision hip replacement with impaction bone grafting.