Colin Callender has brought in All3Media executive Louise Pedersen as Managing Director of UK operations for his production company Playground Entertainment. Pedersen is being tasked with expanding Playground's existing footprint in the UK and overseeing day-to-day activities in the country, reporting to Callender. With Pederson on board, Playground will open offices in London in early 2015. Playground's portfolio includes two upcoming British projects, a six-part…