Apostolic Teaching: Who Stands Out?

Got a question for you. I'm a preacher by 'nature' of my calling and nothing drives me more than to dig out a good message and preach my socks off. Traditionally most in an emotional Pentecostal environment see Apostolic teaching as something less than 'powerful' and, yea, even sometimes boring. In short, I think teaching gets a bum rap as it's vitally important to the Apostolic structure.

However, while I'm a preacher at heart I'm also a Pastor and the longer I lead my people the more need I see for Apostolic teaching. By this I mean that I've learned through time that preaching inspires but teaching impacts and makes an eternal influence in the lives of people. My greatest converts are the ones that have laid hold on my teaching... MUCH more than those that just enjoy my preaching.

So herein is my premise; if teaching is so important then who are some of the great Bible teachers? I'm asking for some specific names both past and present that you heard in a Church setting, a Campmeeting or a Conference setting that (a) kept your attention or (b) put something in your understanding that changed your walk with God forever.

I have to say, looking back, one of the greatest teachers that I've ever heard... one who made a great impact on my spirit... was Charles Grisham. His tender spirit and simple insight to the Word ALWAYS moves me.