Leadership as a Call to Service. the Lives and Works of Teresa of Vila, Catherine of Siena and Th R Se of Lisieux - Paperbackby Christine Cameron (Author) With a foreword from Suzanne Noffke OP. In Leadership as a call to Service. The lives and works of Teresa of vila, Catherine of Siena and Thrse of Lisieux, Christine Cameron looks at a synthesis of the lives and works of the three women doctors of the Catholic Church as servant leaders. The seminal work of Greenleaf (1970) on servant leadership and Spears (1998) with his identification of the ten core characteristics of