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Born in Houston, Texas in 1956, Jonathan spent his early childhood years in New York State, first living in Poughkeepsie (where his sister and brother were born) and, then, Yorktown Heights in Westchester County. His parents were both immigrants: his mother was born in Poland and fled the Nazis during World War II; his father was born in Palestine.
In 1971, Jonathan moved to Israel where he spent seven years, completing high school and two years studying psychology and philosophy at Tel Aviv University. In Israel, he was involved in the Histradut, the country’s labor federation’s political activities, as well as the early flowering of a serious debate about peace.
In 1978, he returned to the U.S., relocating to Los Angeles where he finished a degree in political science at the University of California, Los Angeles (U.C.L.A.). In the early 1980s, Jonathan was one of the founders of the National Writers Union’s Los Angeles chapter. Upon arriving in New York City in 1985, he became active in the union’s national leadership, focusing mainly on organizing new members. He is the proud uncle of four nieces, and a lifelong baseball fan who holds Yankees' season tickets.