Four times capped at international level, the England forward has collected an enviable haul of two domestic Cup winners' medals, three Zurich Premiership titles and a Heineken Cup winners medal - including last year's Premiership and Heineken Cup double.
Speaking of the move, the 31-year-old Green admitted: "I'm very excited about joining such a top class outfit as Leinster. They are a top European side with many great players - six selected for the Lions says it all.
"I'm looking forward to experiencing a different way of doing things at one of the big Irish provincial teams and I hope I can get over there, get my head down and work hard and win silverware."I've signed a two-year deal with the club which gives Charlotte, me and our young son Arthur a change of lifestyle. Having lived in London for 9 years, we're ready for a change."
Meanwhile, Leinster's Ireland and Lions captain Brian O'Driscoll was on hand on Thursday to present his 'alma mater' Blackrock College with their tour jerseys ahead of the Dublin school's participation in the Sanox World Schools Cup competition in Japan.
O'Driscoll is pictured above with current Ireland Schools full-back Luke Fitzgerald, who will captain Blackrock on the Far Eastern tour.
OB Sports are kindly supplying the 2004/05 Leinster Schools Cup champions with their playing and casual gear for the tour's duration.