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He's one of the main characters, portrayed by Matt Lintz.
"STEVIE TAGGERT is a tough, young boy employed by Dr. Kreizler as a driver and houseboy. Rescued from the streets by Dr. Kreizler, he, like Mary and Cyrus, has been given a second chance at a better life, and provides companionship as well as service to the doctor."
New York City, March 3rd, 1896.  During one of his nights out, Stevie stumbled upon a distraught child on Bowery Street. The urchin was in a state of shock, rambling about something bad on the under construction bridge. He immediately took him to Dr. Laszlo Kreizler's house, where the factotum Cyrus took care of him while Mary, the housekeeper, went to wake up the master of the house so that he could interrogate the urchin about what he witnessed. Once the urchin revealed that a murder had been committed and that the victim was a boy dressed in girl's clothes, Stevie was entrusted with the task of tracking down John Schuyler Moore and leading him to the crime scene. Before leaving, Kreizler ordered Stevie to tell Moore to bring his drawing kit.
Stevie traced Moore to the brothel that the man used to go almost every night and, once on the caleche, the young driver whiz through the streets, headed to the crime scene at the under construction bridge. In the meantime, he briefed Moore that Commissioner Theodore Roosevelt would be there, advising him to invent some excuse to be able to overcome the handful of policemen who barricaded the road.
A few days later, Stevie let a frantic John Moore entering Kreizler's house while the rest of the household was in the parlor, making music. 
Stevie dined with Cyrus outside the Delmonico's restaurant, waiting for their employer in the carriage. Cyrus was wise enough to remember Stevie to clean their hands, while the boy was already enjoying a leg of lamb.
Appearance and Personality Edit
Stevie Taggert is a tall, thin young man in his late teenage years. Unkempt and perpetually sullen, Stevie has a clear complexion with freckles on the bridge of the nose and the cheeks, short brown hair and brown eyes. He seems to be perpetually hungry and looks to Cyrus Montrose as a role model. Fond of Mary Palmer and thankful to Dr. Kreizler, Stevie is not very keen to participate in the investigation unless he has the chance to race with the carriage through the nightly and crowded streets of New York.
Memorable Quotes Edit
- Stevie Taggert (to the team): "I ain’t no fairy!"
- In the novel, Stevie is obsessed with smoking tobacco cigarettes. Even though Dr. Kreizler forbids him from having them, Stevie finds every opportunity to snatch some of them as soon as Dr. Kreizler is distracted.
Episode Appearance Edit
- ↑ Official Overview for Matt Lintz's Stevie Taggart — TNT Pressroom
- ↑ E. Max Frye (writer) & James Hawes (director); (February 19, 2018); "Hildebrandt’s Starling". Episode 5.The Alienist. TNT
- ↑ Hossein Amini (writer) & Jakob Verbruggen (director); (January 22, 2018); "The Boy on the Bridge". Episode 1. The Alienist. TNT
- ↑ Hossein Amini & E. Max Frye (writers) & Jakob Verbruggen (director); (January 29, 2018); "A Fruitful Partnership". Episode 2.The Alienist. TNT