We asked John Coffee, a former corporate lawyer who is a professor at Columbia Law School, to weigh in.

FORBES: Magazine Article

The Justice Department's two-front litigation campaign is "a warning signal, " said John Coffee, a law professor at Columbia University.

FORBES: Magazine Article

"Buying what you're selling during a distribution has a strong tendency to artificially inflate the price, " says Columbia Law School securities expert John Coffee.

FORBES: Entrepreneurs