Cityfile: New York's Most Notable and Influential

• The market is kicking off the week on a positive note. [CNN, WSJ]
• The investigation into Bernie Madoff's scheme is now focused on some of his biggest investors: Jeffry Picower, Stanley Chais, and Carl Shapiro. [WSJ]
• Bradley Ruderman, the founder of LA-based Ruderman Capital Partners, has been arrested and is charged with bilking investors out of $44 million. [DB]
• Steve Rattner is making waves again, although it has nothing to do with the unfolding pension fund scandal. It's his construction of a $15 million summer home on Martha's Vineyard that is now angering neighbors. [P6] More

• It wasn't just overly tanned Jews in Palm Beach who were ripped off by Bernie Madoff. London's Evening Standard says Italian fashion designer Valentino may have been a victim as well. [ES]
• Ten days before his arrest, Bernie Madoff convinced elderly Palm Beach entrepreneur and philanthropist Carl Shapiro into giving him an additional $250 million. [WSJ]
• Bank Medici founder Sonja Kohn, who raised $2.1 billion for Madoff from rich Europeans and Russians, is now missing. [NYT]
• Disgraced Madoff pal Ezra Merkin will step down as chair of GMAC. [FT]
• German billionaire Adolf Merckle, who committed suicide earlier this week, was in debt to the tune of $6.7 billion. [BN]
• American companies shed 693,000 jobs in December. [MW]
• Bank of America's Ken Lewis will not be getting a bonus. [BN]
• Ken Griffin's main hedge fund dropped 53 percent in 2008. [CNN]