Frank S. Mead was a renowned authority on the historic and contemporary church. He served as editor of the Christian Herald, was a consulting editor for several large publishing houses, and wrote articles for the Christian Century, Christian Herald, and Reader's Digest.
for a quick reference, this is okay, but it's largely speculative. a lot of the commentary and even some of the references to biblical stuff assume a level of knowledge that may have been common in 1934, but is not necessarily so now. there were a few instances of 'oh I didn't think of that before', but on the whole, it was not really of much value.