Ellen E Jones and Mark Kermode explore the influence of David Simon and The Wire, as the Baltimore-set opus celebrates its 20th anniversary this year.

Beginning his career as a police reporter for the much respected Baltimore Sun, David Simon eventually became disillusioned with changes being made at the paper and spent a year embedded with the Baltimore Police Department’s Homicide Unit. That resulted in the book Homicide: A Year on the Killing Streets, which became the basis for the TV show Homicide: Life On The Street.

Simon followed that with another book, The Corner: A Year in the Life of an Inner-City Neighborhood, which was adapted for TV as The Corner, and then created The Wire, which changed television forever.

Simon has since been behind the shows Generation Kill, Treme, The Deuce and The Plot Against America. His latest project We Own This City sees him return to Baltimore, this time to tell the true story of the rise and fall of the Baltimore Police Department’s Gun Trace Task Force and the corruption surrounding it.

Ellen looks at the influence of David Simon’s work with a focus on unconventional casting - Simon repeatedly casts non-actors, and people with first hand experience of the subjects he explores. She speaks with casting director Pat Moran, who has worked alongside Simon on several projects. She also talks to Ronan Bennett and Gerry Jackson. Ronan is the creator and writer of Top Boy and Gerry is the series’ story consultant. Gerry is a fitness trainer but his knowledge of Hackney and connection to the local community helped Ronan to write Top Boy, and to find local talent to feature in the show, in an echo of The Wire.

And Mark goes back 20 years to speak to someone who was there when The Wire began. Actor Clarke Peters was on the show for all five seasons, playing fan favourite Detective Lester Freamon and delivering some of the show’s greatest lines. Mark also talks to Professor Liam Kennedy, editor of The Wire: Race, Class, and Genre - a series of essays exploring the show's portrayals of race, drug war policing, deindustrialisation, and the inadequacies of America’s civic, educational, and political institutions.

Also, Top Boy star Ashley Walters shares what he’s been watching.

Screenshot is Radio 4’s guide through the ever-expanding universe of the moving image. Every episode, Ellen E Jones and Mark Kermode journey through the main streets and back roads connecting film, television and streaming over the last hundred years.