In 1895, he returned to the Netherlands to serve as chief rabbi in
Leeuwarden and then, in 1899, he became chief rabbi in
The Hague. On 1 May 1903, he was selected by Copenhagen's to succeed
David Simonsen as chief rabbi of Denmark. His term there was contentious due to his opposition to
interfaith marriage, allowing children born of Jewish fathers and non-Jewish mothers to convert, and participation in a Danish ecumenical national day of prayer, among other issues, and he was removed from the post on 18 January 1910. Because Lewenstein's contract stated the position was a lifetime appointment, his dismissal sparked a legal battle that ended up before the
Danish Supreme Court. In the end, Lewenstein was awarded in 1912 (). In 1912, Lewenstein became chief rabbi for the , an
Orthodox community in
Zürich, Switzerland, that split from the
Israelitische Cultusgemeinde community in 1898. He remained the chief rabbi there until 1940. In 1945, he returned to The Hague for a brief time to help the Dutch Jewish community rebuild after World War II. == Personal life ==