JOSEPH Cassano, a former AIG executive who played a big role in bringing the giant insurer to its knees, will face a grilling this week from a US panel investigating the causes of the financial crisis. Cassano will rub shoulders with a star cast, which includes Goldman Sachs president Gary Cohn and chief financial officer David Viniar. Cassano, who ran AIG Financial Products, has evaded public appearances since the 2008 collapse.