Author Of 'Why Wall Street Matters' Talks About Ackman's 'Whopper Of A Loss' By: Benzinga via Benzinga March 30, 2017 at 14:49 PM EDT William Cohan, author of 'Why Wall Street Matters,' was a guest on CNBC to talk about Bill Ackman's letter to investors in ... Read More >> Related Stocks: Valeant Pharmaceuticals International, Inc.