One of my favorite pastry chefs and teachers is Nick Malgieri. His baking books are awesome as well. Here he is being interviewed about cakes and the science of baking.
http://beta.wnyc.org/shows/lopate/2010/jun/04/please-explain-cake-baking/
http://beta.wnyc.org/shows/lopate/2010/jun/04/please-explain-cake-baking/