The book details the history of a man who discovers a pinpoint wormhole in space, and slowly he learns to harness its power to succeed in life.
To jog your memory:
It starts with a guy at an overlook, making out with his girlfriend. Maybe overlooking a rocket field. He makes a lofty promise to her (maybe that he'll own all of this one day?). Eventually they get married and become fabulously wealthy, thanks to the discovery of the wormhole.
It ends with him and his wife repeatedly stepping through one end of the wormhole in his business empire's vault, emerging out the other end later in time. A valet then walks them across the room to the entrance to the wormhole, to repeat the process. Thus they jump forward in time until science knows how to make them immortal.
It features him meeting 2 other versions of himself -- one with a moustache, one with a beard.
At one point, an enemy ship is hurtling toward our ship, but our ship has the wormholes on either side of it. The enemy ship is deflected off course and into wormhole 1, by a damaged ship flying out of wormhole 2 -- the same ship, sent a few seconds into the past.
What's the name of this book?