Retail giant Wal-Mart Stores Inc on Wednesday announced the president and chief executive of its European operations, Dave Ferguson, had retired. The Arkansas-based firm said Ferguson joined it eight years ago and in 1996 was promoted to president and CEO of Wal-Mart Canada. He was given the top role at Wal-Mart Europe, which oversees 260 Asda stores in the UK and 92 outlets in Germany, in 2000.