He studied at College of Education in Bishkek and the University of Chişinău, did his doctorate at Leningrad University on a thesis advised by Mark Krein (1954), and went to University of Moscow for a habilitation degree. He joined the faculty at Teacher's college in Soroki, at the teachers college in Bălţi before returning to Chişinău where he was elected into the Academy of Sciences and also being appointed head of functional analysis at University of Chişinău (1964-73). After moving to Israel, Israel joined Tel Aviv University (1974) and was at the Weizman Institute at Rehovot. Since then he also had positions at Vrije Universiteit in Amsterdam (1983), as well as at University of Calgary and University of Maryland, College Park. He founded the Integral equations and operator theory journal (1983).