Noted neuroscientist Vilayanur S. Ramachandran, Director of the Centre for Brain and Cognition at the University of California (San Diego). His work has been featured on a NOVA special 'Secrets of the Mind'  on PBS.
From a BBC interview 
Like most scientists I'm agnostic. If you're talking about God in some very abstract sense, like in India the Dance of Shiva or in the Spinoza sense of the word God, then I'll say I have no problem with it. But if you're talking about an old guy there who's watching me and making sure I behave myself and that I pray to him every day and that I will be punished in Hell if I do something wrong, I don't believe in that. And I don't want to offend anybody here, but that's my personal view.