David Zurawik, award-winning media critic of The Baltimore Sun and my colleague and friend, has retired from his position after 32 years at the newspaper. With pithy zest and a unique voice, the Z on TV columnist spent decades smartly chronicling and critiquing the television industry in all its forms — from network sitcoms to documentaries and British dramas on PBS to Trump’s media bonfires and cable TV’s political coverage of presidential elections.