Daniel Martin Klein is an American writer of fiction, non-fiction, and humor. After majoring in philosophy at Harvard, and a brief career in television comedy, he began writing books, ranging from thrillers and mysteries to humorous books about philosophy. These include the New York Times bestseller Plato and a Platypus Walk Into a Bar: Understanding Philosophy Through Jokes (with Thomas Cathcart), and the Sunday Times bestseller Travels With Epicurus.

The four Elvis Mysteries were originally published in the early 2000s to great criticial and commercial acclaim.