 Gilbert has a broad range of experience from international humanitarian work, especially in locations where medical and political issues merge.Since the 1970s, he has been actively involved with solidarity work concerning Palestinians, and he has served as a doctor for several periods in the Palestinian territories and Lebanon for NORWAC.His efforts have been central to leading the city of Tromsø, since 2001 a twin town of Gaza, to claim to be the city that has sent more health workers to the Palestinian territories than any other in the world.