Since I clearly haven't been covering that ground myself, in spite of my blog's title. Sad.
Father Longenecker at Standing on My Head does the job quite nicely. As most folks obsessed with Lewis and Tolkein know, the two had an uneasy relationship that finally imploded. It's sad to think of, especially since Tolkein originally brought Lewis to Christ through myth and imagination. Ironically perhaps, it was myth that also drove them apart. (Well, that and personality clashes).
Contrary to popular belief however, Tolkein wasn't just a prickly professor engaged in world-building and myth-making. He was first and foremost a devoted husband and father, as is obvious in the posthumous collection of "Father Christmas letters" that he wrote and illustrated for his children.
And you have to love how Father Christmas tells the kids how to take care of their new kitten (with spots so she's easy to find in a snow storm):