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After the media mogul earned his fortune, he created an endowment for his hometown synagogue, which was renamed for his parents: Temple Shalom, the William and Charlotte Bloomberg Jewish Community Center of Medford. The congregation belongs to the Conservative movement, which emphasizes traditional observance while allowing some changes that adapt to modern times.

Mr. Bloomberg has given millions to Jewish causes in the United States and in Israel. He emphatically supports the Jewish state and has traveled there numerous times.

This past February, he dedicated a $6.5 million emergency rescue service facility in Jerusalem named for his father. On the same visit, he toured the southern Israeli town of Sderot, expressing solidarity with a small community that has been a frequent target of Palestinian rocket fire.

“I think there’s a comfort level that he has with his identification as a member of the Jewish community,” said Rabbi Michael S. Miller, chief executive of the Jewish Community Relations Council of New York. Every year since he was elected, Mr. Bloomberg has hosted a reception with kosher food at Gracie Mansion, the city’s official mayoral residence, commemorating the council’s Jewish Heritage New York project.

“He’s an ardently strong supporter of Israel,” Mr. Miller said.

However, neither of the mayor’s two daughters celebrated a bat mitzvah, and Mr. Bloomberg, who is divorced, officiated at his daughter Emma’s wedding, which was a civil ceremony.

“He’s a fairly assimilated Jew,” Mr. Greenebaum said. “I don’t think it will be a big thing.”

c Associated Press writer Sara Kugler contributed to this report.