As far as his home field is concerned, he comes to Fenway Park from Safeco Field. According to ESPN park factors, Fenway Park is a vastly superior ballpark for hitters than Safeco (a +12.5% improvement with respect to runs and a +7.8% improvement with respect to homers). Batting charts indicate that he will benefit somewhat from the Green Monster (3-4 home runs), but because he tends to hit to all field the impact will be less than you might anticipate.