Jennifer Maas TV Business WriterDisney Junior exec Joe D’Ambrosia has been hired as executive vice president and general manager of Sony Pictures Television’s Silvergate Media. D’Ambrosia will be taking over for Silvergate founder Waheed Alli, who is stepping down from his post as CEO this summer.In his new role at the Sony-owned children’s programming producer, D’Ambrosia will serve as Silvergate’s creative and strategic business leader, overseeing day-to-day operations of the company.