The Claypool Papers are a complete archive of the ministerial records of a noted American preacher. His writings are especially representative of modern themes of redemption, personal Christian witness, and the valuation of life in its diverse expression. Of narrower but significant interest is Claypool's theological transformation from Southern Baptist minister to Episcopal priest. The archive contains audiovisual recordings, indexed sermons, correspondence, books, photographs, news clippings, publicity materials, and scrapbooks.

This archive comprises the personal papers of the Rev. Dr. Leonel Lake Mitchell, primarily from his time spent teaching liturgics at The University of Notre Dame and Seabury-Western Theological Seminary. It includes: liturgical materials, particularly on baptism and ministry; authored works on the subject of liturgics; correspondence and course materials; and memorabilia.