From 1987 to 1989 he was Senior Embryological Advisor and Manager of Laboratories at the IVF/Infertility Clinic of a London private hospital. From 1995 to 1996 he was Visiting Professor at the Weizmann Institute, Israel. From 1996 to 2000 he was a consultant at the University of Warwick, jointly to the Ecosystems Unit of the Biology Dept and the Mathematics Institute. He was an Honorary Professor at the Mathematics Institute of the University of Warwick and a Visiting Professor at Durham Business School.