Mary C. Neal, MD, Writes Guest Blog on “Huffington Post June 11, 2012 Buy Now AmazonBarnes & NobleBooks A MillionChristianBook.comCokesburyIndieboundMardelParablePowell'sTargetWalmart Mary C. Neal, MD, the author of The New Times bestseller To Heaven and Back, wrote a guest blog on the Huffington Post about the lesson she learned about gratitude and joy from her drowning experience while kayaking on a South American river.