ABC’s "20/20," the network’s award-winning primetime TV news magazine, has been exclusively led by male executive producers during its first 42 years on the air. Now in its 43rd year, the ABC News president has announced the promotional appointment of only the fourth executive producer in the show’s history — and this time a woman who is a South Jersey resident and the first minority to hold the top job. She is [UVA Law alumna] Janice Johnston of Cherry Hill, a longtime Black broadcast journalist with ABC, a lawyer and six-time Emmy-award winning producer who has been a producer for ''20/20'' ...