Haha! As amazing as that would be (in a comedic sense), he doesn't have a secret identity. He basically lives his life without apology and without concern for most things.
For example, he doesn't need to "protect" a wife, girlfriend, or family because he doesn't care about forming relationships and is astranged from all his relatives. He simply doesn't pay any attention to anything that doesn't benefit him on some level. (Usually ego-wise.)
Essentially, he's a look at what it would be like to have a "real" near-immortal super-hero. He's not evil, and he's more good than bad... but he does some pretty awful things simply because he can. It helps to think of the average U.S. Politician or C.E.O. Those are the real folks with the most power, after all.
