Due to the concussions , the Phillies converted him into a first baseman .
Joseph began the 2015 season with the Lehigh Valley IronPigs of the Class AAA International League , where he suffered his third concussion in May 2015 .
Due to the concussions , the Phillies converted Joseph into a first baseman .
Joseph began the 2015 season with the Lehigh Valley IronPigs of the Class AAA International League , where he suffered his third concussion in May 2015 .