Timothy Keller is the founding pastor of Redeemer Presbyterian Church in Manhattan He is also the co-founder and vice president of the Gospel Coalition. You can find more sermons by Dr. Keller at http://www.gospelinlife.com/.
How to make Jesus the "hero" of every sermon.
While there are gray areas, there are also black-and-white guidelines.
The Keller method: Plan ahead. Read books. Keep a weekly schedule. Write several drafts. Pastor real people.
@Gil_Virgo He'll occasionally speak at an event, but that's about it.