Stay up to date with Claus Bertermann ( 1965) . Discover works for sale, auction results, market data, news and exhibitions on MutualArt.

These 46 Pro Excel Tips Will Transform You Into a Spreadsheet Magician Microsoft's spreadsheet program can do way more than you might realize. These are the hacks and tricks you need to know.

Here are the stars who died this year, including Hulk Hogan, Ozzy Osbourne, Terence Stamp, Graham Greene, and Brian Wilson.