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Professor, The Cyprus Institute, Nicosia, Cyprus, 2010-2016
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Visting Professor, Univ. of Frankfurt, 2007, 2008
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National Taiwan Univ. Taiwan, 2008
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President of the International Commission on Clouds and Precipitation, 2006-2012
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Visting senior Scientist, UMBC-NASA Goddard, 2004-2005
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Head of the Porter School of Environmental Studies, Tel Aviv University, 2000-2004
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Visiting Professor, Inst. for Atmos. Physics, ETH, Zurich, Switzerland, 1999
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Chair Professor, Goldenberg Chair in Atmospheric Physics, Tel Aviv University, 1994
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Senior Scientist, Sabbatical leave- -National Research Council, NASA Goddard Space Flight Center, MD., 1992-1993
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Dean for Research and Vice President of Research and Development, Tel Aviv University, 1987-1992
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Chairman of the Department of Geophysics and Planetary Science, Tel Aviv University, 1985-1987
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Full Professor, Tel Aviv University, 1984
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Visiting Senior Scientist, ASEE NASA, Stanford Fellowship, 1985
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Senior Scientist, Sabbatical leave- -National Research Council, Associateship Program, NASA, Ames Research Center, Theoretical and Planetary Branch , Feb.-Oct.-1981
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Visiting Senior Scientist, National Center for Atmospheric Research Boulder Colorado, June - Aug. 1978 and Aug.-Sept.- 1979
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Associate Professor, Tel Aviv University, Dept. of Geophysics & Planetary Sciences, 1978-1984
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Visiting Professor, Ohio State University, Columbus, Atmos. Sciences Program, Aug. 1977
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Senior Post Doctor Fellowship, Sabbatical leave - National Center for Atmospheric Research, Advanced Study Program, 1976-1977
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Senior Lecturer, Tel Aviv University, Dept. of Geophysics & Planetary Sciences, 1974-1977
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Lecturer, Tel Aviv University, Dept. of Environmental Sciences, 1971-1974
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Research Associate, University of California at Los Angeles, Department of Meteorology, 1970-1971