In his frequent correspondence with Albert Einstein, Lerski reflected on the state of the Jewish community. Einstein, aware of Lerski's idea as early as 1930, wrote to him:
"The Jews today are more a national than a religious community. The documentation of this type, as difficult as it may be, thus fulfills an active wish."
In 1932, Lerski settled in Tel Aviv, where he remained until his return to Europe in 1948. He continued his portraiture work, expanding his concept for Jewish portraits to include the series "Palestinian Portraits" and "Arab Portraits."