Walter "Bill" Clark (born May 20, 1944) is a former New York Police Department first grade detective and an award-winning television writer and producer.
Born in St. John's, Newfoundland, Canada, Clark grew up in Brooklyn, New York, in an area now known as Park Slope. He is a veteran NYPD Detective First Grade and television Writer and Executive Producer. Clark joined David Milch and Steven Bochco's NYPD Blue in the first season as technical consultant and continued to draw on his twenty-five years experience with New York undercover and homicide units to ensure that the series accurately and realistically portrayed the work of New York City detectives. He went on to win two Emmy Awards, and was also honored with a Writers Guild of America Award, a Peabody Award and two Humanitas Prize.
He is the father of two daughters, Natalie and Jennifer, and a stepdaughter Kristine. Clark and his wife Karen Clark, a former Lieutenant whom he met while working as a detective, live in both Saratoga Springs, New York and Los Angeles, California.