Randy Chapman is great - you will love having him as your photographer!! He will work with you as far as when to do the photos - so if you have preferences, please feel free to discuss them with him.
For our wedding, we had him all day... so he did pictures before the ceremony (the boys had theirs done first, then the girls), during, after (entire wedding party, with the parents, and bride & groom photos), at the reception, *after* the reception (we had him take photos of us at the Wilderness Lodge), and at our Illuminations Dessert Party.