Early in his career, Smerling was the associate producer of NBC's Gangs, Cops and Drugs with Tom Brokaw, and The New Hollywood. He then founded production company Notorious Pictures, producing and directing more than a hundred television commercials and music videos.[5]
In 2010, Smerling produced and wrote his first narrative feature film All Good Things, starring Ryan Gosling, Kirsten Dunst and Frank Langella, about the suspected murderer and real estate scion Robert Durst. The film was the predecessor to the 2015 HBO documentary miniseries The Jinx, which Smerling co-wrote and produced with Andrew Jarecki and Zachary Stuart-Pontier.[7] He won the 2015 Primetime Emmy Award for Outstanding Documentary Series and was nominated for Outstanding Cinematography for Nonfiction Programming.[8]
Smerling and Stuart-Pontier co-created the podcast Crimetown, which debuted in 2016 and quickly became the most popular U.S. podcast on iTunes. Each season of Crimetown examines how organized crime shaped an American city, starting with Providence, Rhode Island, in season one.[9] They also co-created The RFK Tapes a Crimetown Presents podcast about the assassination of Robert F. Kennedy.[10] In 2022, he hosted a 15-part podcast series focused on the Mahoning Valley mafia and Congressman Jim Traficant called "Crooked City: Youngstown OH."[11]