Main •
Daniel Brühl as Laszlo Kreizler, who has focused recently on children suffering from mental illnesses, called upon by his former Harvard classmate Theodore Roosevelt to try to understand the psychology behind grisly child murders. He is Hungarian and comes from a well-off family. He lives alone save for his maid, valet, and stable boy. He has a lame arm, and frequently seeks out the insight of former patients and criminals for help with his investigations and research. •
Luke Evans as John Schuyler Moore, •
Rosy McEwen as Libby Hatch (season 2), a young nurse at the Lying In Hospital •
Melanie Field as Bitsy Sussman (season 2), an Irish police officer who dislikes Roosevelt and who tries to subvert the team's investigations at every possible turn • Antonio Magro as
Paul Kelly, a mobster who runs a brothel frequented by high society men • Jackson Gann as Joseph, a young boy who works at a brothel and who endears himself to Moore •
Michael Ironside as
J.P. Morgan, a financier and banker. He uses Connor and Byrnes as his muscle to enforce protecting his fellow members of high society. •
Sean Young as Mrs. Van Bergen, the matriarch of the fictional van Bergen family. She is generally unperturbed by rumors about her son's actions, but nonetheless is compelled by Byrnes to take action to protect him. •
Josef Altin as Willem Van Bergen, a young man who preys on prepubescent boys. He suffers from syphilis. •
Peter McRobbie as
William Lafayette Strong, the mayor of New York City from 1895 to 1897. He echoes Morgan and Byrnes' concerns for the city's upper crust. •
Bill Heck as John Beecham, a former Plains resident now living in New York
In season 2 •
Matt Letscher as
William Randolph Hearst, the editor of the
New York Journal •
Michael McElhatton as Dr. Markoe, director of the Lying In Hospital •
Heather Goldenhersh as Matron, the head nurse at the Lying In Hospital •
Emily Barber as Violet Hayward, John's fiancée, who is Hearst's goddaughter •
Bruna Cusí as Señora Isabella Linares, the Spanish mother of a missing baby • Brittany Marie Batchelder as Joanna Crawford, Cyrus's niece, a trained reporter who runs a seedy bar • Georgia Lowe as Milly, another assistant to Sara at the agency •
Diego Martín as Narciso Linares, the Spanish ambassador-general •
Demetri Goritsas as Bernie Peterson, John's editor at
The New York Times •
Frederick Schmidt as
"Goo Goo" Knox, a street criminal who is Libby's lover •
Lara Pulver as Karen Stratten, a professor of psychology with interests similar to Kreizler's •
Gavin O'Connor as Murphy, a detective at the NYPD •
Peter Coonan as Ding Dong, a henchman of Goo Goo Knox. == Production ==