After several employees came forward recently with allegations of mistreatment at Ellen DeGeneres’ daytime talk show, three executive producers have been fired.  Executive producers Ed Glavin, Kevin Leman and co-executive producer Jonathan Norman parted ways with the syndicated talk show Monday following allegations of a toxic workplace environment.  This is according to a person familiar with the situation but not authorized to speak publicly.  DeGeneres, who was adamant about “ensuring this does not happen again” apologized to her staff  directly  in a videoconference call with more than 200 talk-show staffers, who learned of the staffing change, according to a person who listened to the call but was not authorized to speak publicly.