H. J. Lawson

The cover blurb for Infinite Time, the first short book of a series, says Save the girl. Save the day. Save yourself. Not only that, but in the opening pages, Parker (the high-school Hero) blames himself for the death of his Uncle Ben father at the hand of a robber many years ago. Eventually Parker will get a time-travel opportunity to save his father and stop his mother from remarrying the lazy step-father, but not until the second book or later. In the first book, Parker must deal with the high-school bully, a well-written crush on a cheerleader, and a time travel setup that has him meet other time travelers who are given mysterious missions to complete.