Bryan Marsal, CEO of Lehman Brothers Holdings Inc., shares his views about what can be learned from Lehman's failure. "It's virtually impossible for a board of directors to oversee a company the size of Lehman in any meaningful way," says Marsal. "Management needs to be personally responsible." He adds that the United States "needed to have better coordination of all the various regulating bodies." Marsal, who's also co-CEO of Alvarez & Marsal Holdings LLC, explains why he's not too concerned about Greece's sovereign debt.  - Katie Roof