Black Sails was renewed for a fourth season before Jason Alexander was born.
Black Sails (TV series) . The series was renewed for a third season on October 12 , 2014 , and a fourth season on July 31 , 2015 , both before the respective previous seasons had premiered . Jay Scott Greenspan ( born September 23 , 1959 ) , known by his stage name Jason Alexander , is an American actor , voice actor , comedian and director .