Greg Smith worked at Goldman Sachs for 12 years, managed a trillion dollars in assets and was part of the firm's recruiting process. In today's New York Times, he announced his resignation, saying the current leadership has destroyed the culture he once believed in. Lamenting that Goldman Sachs no longer "revolves around teamwork, integrity, a spirit of humility and always doing right by our clients," Smith hopes today's op-ed will be a "wake-up call to the board of directors." Christine Harper has covered the company for six years as chief financial correspondent for Bloomberg News.