This dissertation discusses the impact David Lefkowitz and his ministry had on Dallas during the years of his ministry (1920-1949) at Temple Emanu-El in Dallas Texas, and the years following his death in 1955. The focus is on his involvement in civic activities, although his pastoral activities are also discussed. Sources include interviews with family members, friends and acquaintances, newspaper articles, journals, internet sources, unpublished theses and dissertations about Dallas and related subjects, minutes of the Temple's Board of Directors' meetings, minutes of the Central Conference of American Rabbis, minutes of the Board of Directors' Meetings of the Dallas Jewish Welfare Federation, the Temple Emanu-El Bulletins, and selected sermons, speeches and letters of David Lefkowitz. David Lefkowitz was an important figure in the history of Dallas. He taught, by precept and example, that Jews could participate fully in the civic life of Dallas. Because of his teachings, Jews made a positive difference in the development of Dallas. He has left a lasting impression on Dallas, and through his ministry and hard work, he made Dallas a better place for all its citizens.