The national board of Hadassah: The Women’s Zionist Organization of America has nominated its former treasurer to take over the organization’s top lay leadership position. The board on Sunday officially selected Marcie Natan, currently the national chairperson of Hadassah College in Jerusalem, to become the organization’s president in July. Natan, of Lancaster, Pa., must be approved officially at Hadassah’s annual meeting. She would succeed Nancy Falchuk, who has served as president since 2007. The organization’s top lay position, the Hadassah president serves as essentially a volunteer CEO, wielding an unusual amount of responsibility for a lay leader at a nonprofit.