This work presents the issues of Modern Orthodox Judaism in America, from the decades of the twenties to the sixties, by looking at the activities of one of its leaders, Rabbi Dr. Leo Jung, pulpit rabbi, community leader and writer, whose career spanned over sixty years, beginning in the 1920s. Jung is a fulcrum around which many issues are explored. Rabbi Jung's path crossed with some of the most interesting people of his time. He worked with Chaim Weizmann, the first president of Israel, with Albert Einstein to promote Yeshiva College, with Herman Wouk, American author and Pulitzer Prize winner, and with Pearl Buck, a Nobel Prize laureate and Pulitzer Prize winner.