Among others called to serve alongside them were Monsignor Donald M. Beckmann, director of the Office of Ecumenical and Interreligious Affairs of the Rockville Centre Diocese; Isaac Blachor, Esq., President of the Jewish Lawyers Association of Nassau County as well as Chair of the Committee on Professional Ethics of the Nassau County Bar Association, who volunteered as the Commission's attorney; Mr. Simon Zareh, president of the Conference of Jewish Organizations of Nassau County (COJONC) and member of the Jewish Community Relations Council (JCRC) of New York, who accepted an appointment as Executive Vice President of the Commission; and Mr. Stanley Garczynski, a Polish Catholic Army Officer sent to Auschwitz in 1940 for his resistance efforts and believed to be the survivor with the lowest camp tattoo number alive in America at the time.

[3] With input from the Long Island Historical Society, Mr. Mansour Baradarian, engineer, of Roslyn Harbor, provided critical repairs to Welwyn in preparation for the capital campaign and Opening, at which among the officials and dignitaries in attendance to laud the Commission's collective perseverance and determination to realize this ecumenical accomplishment was United States Representative, The Honorable Gary L. Ackerman.

But if Jews and Catholics and Russians and Greeks and Poles testify to the suffering, it gives it more meaning," [5] while Mr. Chartan's intention was not simply to teach the history of the Holocaust, but to educate people about the shortcomings of all kinds of hatred, prejudice, and intolerance, including antisemitism, racism, and bullying.

In 1996, the Louis Posner Memorial Library, Long Island’s most extensive collection of literature centered around the Holocaust, genocide, anti-discrimination, and other forms of hate would open at the museum.

[7] Harriet Pratt - a horticulturist - was an avid proponent of nature and preservation, championing the creation of the garden adjacent to the western side of the mansion as well as the installation of numerous greenhouses on the property.