During the George Steinbrenner era the New York Yankees have won nine American League pennants: 1976, 1977, 1978, 1981, 1996, 1998, 1999, 2000 & 2001.
During the George Steinbrenner era the New York Yankees have won six World Series championships: 1977, 1978, 1996, 1998, 1999 & 2000.
Dick Williams won the 1973 World Championship with the Oakland Athletics. Why list this here? He was signed by the Yankees following that season and the Athletics and Yankees fought about the contract throughout the entire offseason. The Yankees finally voided the contract and Williams sat out of baseball during the first part of the 1974 season.