Bachelor, University Northern Iowa, 1964. Master of Arts in English, University Northern Iowa, 1984. Master of Library Science, University Missouri, 1969.
Junior high teacher Yale-Jamaica-Bagley Community Schools, Iowa, 1964—1966. School library media specialist Cedar Falls Community Schools, 1969—1979. Youth collection library and professor University Northern Iowa, 1980—2008, co-director uni children's literature workshops, 1986—2007.
(Book by Harmes, Jeanne McLain, Lettow, Lucille)
Member of Association for Childhood Educational International, International Reading Association, American Library Association, Iowa Educational Media Association (president 1994-1995, Presidential Citation 1995).
Married Gary J. Lettow, July 25, 1964. 1 child Karl Josef.