“Lost Childhood” has been produced in a variety of formats since, including concert readings and piano-vocal workshops, and in a staged workshop in Israel’s Tel Aviv in 2007. In 2010, in celebration of Nir’s 80th birthday, scenes were performed at a lavish party organized by his daughter, Sarah Maslin Nir, a New York Times reporter. His eldest son, Daniel Nir, a financial contributor to the opera’s development, said, “The work combines my father’s double passions: to get his story out and music.” He and his brother, Aaron Nir, following their fat...