Lawrence G. McDonald, the author of "A Colossal Failure of Common Sense: The Inside Story of the Collapse of Lehman Brothers," speaks to WSJ's Dennis Berman about what went wrong at the top of the firm. McDonald says that Lehman just wasn't ruled with an iron fist, "it was ruled with brass knuckles," and that some of the "best and the brightest" who tried to bring attention to the subprime risks were immediately silenced by leaders at Lehman.

Lawrence G. McDonald, the author of "A Colossal Failure of Common Sense: The Inside Story of the Collapse of Lehman Brothers," speaks to WSJ's Dennis Berman about what went wrong at the top of the firm.