Katzir is the Chair of ILEOS, the Israel Lasers and Electro Optics Society, and the Chair of the bi-annual OASIS (Optical Applied Science in Israel) international conferences that this society organizes in Israel. He has been a member of the board of governors of SPIE, the International Society for Optics and Photonics, a member of the board of IUPAP, the International Union of Pure and Applied Physics, and of other international bodies. He has organized and chaired tens of international symposia and conferences in the fields of biomedical optics, optical fibers, and electro-optics.