John F. Kippley has been active in the family planning movement since 1968 and co-authored The Art of Natural Family Planning with his wife, Sheila.
“I should say that my wife and I, while still Protestants, found the first edition of this work to be so luminous and compelling as to help change our minds on the matter of contraception.”Scott Hahn, Author, Rome Sweet Home
"A veritable mine of information, Sex and the Marriage Covenant is must reading for anyone concerned with marriage, sexuality, and the family."William E. May, Author, Marriage: The Rock on Which the Family is Built