1) John McNamara
, professor of medieval languages and literatures of England, Scotland, and Ireland at University of Houston.
2) John Paul Flanagan McNamara
, b. 1962
, television writer and producer (also a couple of YA books in the early '80s).
3) John N. McNamara. The cover of Lessons Learned
shows it's published by McNamara Publications, Inc., which also published other cake-decorating books by one John N. McNamara. I'm going out on not much of a limb and assuming that Magic in Frosting
is the same author.
4) John McNamara, 1912
-2004, of the Bronx County Historical Society.
5) John McNamara, 1821?-1885
, presumably an Episcopal clergyman.
Clues for future disambiguators:Der Löwe aus Texas
was published by in 1974, Extra!
in 1945, and I'm guessing the pair of comedies
is also by John McNamara #2, since they're about YA themes and written around the same time as his books.