Florian Sprung
One of the most intelligent people Ive met (he was a post-doc @ IAS, Princeton.) His course was as difficult as you wanted b/c there was a fair curve. The first 7wks were groups(most of Dum&Ft Ch1-6) & the rest of the semester was characters & representations of finite groups. He didnt hold us back in fear of going too fast, which I appreciated.