Dr. John Thackery is a fictional character from the television series The Knick, which is set in the early 1900s. He is portrayed as a brilliant but troubled surgeon working at the Knickerbocker Hospital in New York City. His character is known for his innovative surgical techniques and struggles with addiction. Throughout the series, Dr. Thackery faces various challenges, including the limitations of medical knowledge at the time and the societal issues surrounding race and gender. His dedication to advancing medicine often puts him at odds with his colleagues and the hospital administration.