Dr. Gilbert co-founded NORWAC, a Norwegian-Palestinian humanitarian aid organization. He worked in an underground Palestinian refugee camp hospital in Beirut during the 1982 Israeli invasion and bombardment of Lebanon and again in Beirut during the Summer 2006 Israeli war against Lebanon. He was one of only a small handful of westerners in Gaza during the Israeli attack from Dec. 27th 2008 to January 18th, 2009. After the attack, he testified as an expert witnesses at subsequent Human Rights Committee Sessions held at the United Nations in Geneva.