Gustav Pollak presents a biography of Michael Heilprin, a prominent American Jewish intellectual and scientist, and his sons. Heilprin was known for his influential writings on science and religion, as well as for his role as a founding member of the American Jewish Historical Society. This biography offers a unique perspective on 19th century American intellectual life. This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work is in the "public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.