MEET THE BOSS: Fred Hassan, Schering Plough

Chief executive tells how he transformed a company in freefall, oversaw $41.1bn merger with Merck.

In 2003, when Fred Hassan took over as chief executive at Schering-Plough, the company was in freefall and being investigated for accounting irregularities.

In 2008 he led the company to net profits of over $18.4 billion and in 2009, he successfully oversaw the $41.1 billion mega-merger with Merck.

Here, he says how the incredible turnaround happened.