Mark Erstling, currently the acting president of APTS, has been named senior v.p. of system development and media strategy at CPB. In his new position, Erstling will “oversee all of CPB’s activities related to public television and related digital media platforms except for content,” according to a release. Since 2001, Erstling has served as executive v.p. and COO of APTS, where he manages deployment of the Digital Emergency Alert System for the Department of Homeland Security and heads up development of the American Archive for public broadcasting. He has also led APTS efforts to educate consumers about the digital transition. Erstling has been acting president since John Lawson stepped down in March. Previously he was g.m. of WPSU TV and radio at Penn State University and a producer/director at WJCT in Jacksonville, Fla.