Including the non-governmental organisation of experts committed to expanding the frontiers of space, what were the other two societies Loeb was elected fellow of?
Avi Loeb Abraham (Avi) Loeb is an American theoretical physicist who works on astrophysics and cosmology. Loeb is the "Frank B. Baird Jr. Professor of Science" at Harvard University. He serves as Chair of the "Harvard Astronomy department", Chair of the Advisory Committee for the "Breakthrough Starshot" project - which aims to launch lightweight spacecraft towards the nearest stars using a powerful laser, founding director of Harvard's "Black Hole Initiative" - the first interdisciplinary center worldwide dedicated to the study of black holes and director of the "Institute for Theory and Computation (ITC)" within the Harvard-Smithsonian Center for Astrophysics. Loeb is an elected fellow of the American Academy of Arts and Sciences, the American Physical Society, and the International Academy of Astronautics, as well as Vice Chair of the Board on Physics and Astronomy of the National Academies. Within Harvard, Loeb serves on the President's Task Force on Diversity and Belonging, the Provost's Allston Academic Planning Committee, and the FAS Dean's Faculty Resources Advisory Committee. In December 2012, "TIME" magazine selected Loeb as one of the 25 most influential people in space. In 2015, Loeb was appointed as the Science Theory Director for the Breakthrough Initiatives of the Breakthrough Prize Foundation.
European Astronomical Society The European Astronomical Society (EAS) is a learned society, founded under the Swiss Civil Code in 1990, as an association to contribute and promote the advancement of astronomy in Europe, and to deal with astronomical matters at a European level. It is a society of individual professional astronomers, and all European astronomers can be members independently of their field of work or country of work or origin. The society offers a forum for discussion on all aspects of astronomical development in Europe, and is the organisation that represents the interests of astronomers in discussions of European-wide developments.