Time Travelers Never Die by Jack McDevitt (Penguin Group, 2009)
On the cover of this novel, Jack DeVitt was described as the successor to sci-fi greats Isaac Asimov and Arthur C. Clarke, and I can see why. His style screams “20th century middle-aged male.” Asimov and Clarke were very popular, intelligent, forward-thinking writers, but they had a very male-oriented perspective. That being said, the book is well written and hard to put down. But McDevitt’s time travelers follow much looser rules than those set by other science fiction authors (such as Connie Willis). It’s perfectly acceptable for a time traveler to exist twice in the same time period, for instance. The men in this story visit times from ancient Greece to the present (and even the future) with very little concern for their impact. They’re not completely selfish though – they bring back a whole collection of ancient Greek plays that had been lost to us.