 Hava worked at the National Institute for Oceanography in Haifa until 31 December 1994, when she was required by law to retire.However, as she was doing essential research and environmental monitoring, she was re-contracted beginning April 1, 1995 until June 30, 1999.During her time at the "Sea Fisheries Research Station" and, later, in IOLR, Hava published and co-published dozens of papers in marine chemistry and biology.