Timeline: The Celtics’ Doc Rivers era ← Related Article Visit The Boston Globe Share on Twitter Share on Facebook Comment on this Scroll to top of page Barry Chin/Globe Staff/File Celtics head coach Doc Rivers (right) will leave Boston to join the Clippers, if the league approves the deal. Jim Davis/Globe Staff/File 2012 Kevin Garnett (right) is not part of the current deal with the Clippers. Jim Davis/Globe staff/File 2012 Rivers received his first coaching opportunity with the Orlando Magic in 1999. John Tlumacki/Globe Staff/File 2012 He became the 16th coach in Celtics history in 2004 and led the team to victory in the 2008 NBA Finals. Bill Greene/Globe Staff/File 2011 In 2011, he agreed to a five-year extension with the Celtics. Barry Chin/Globe Staff/File His contract with the Clippers would be for three years at $21 million, league sources said.