Dr. Laszlo Kreizler is a fictional character created by author Caleb Carr in the historical crime novel, "The Alienist." He is a brilliant psychologist and criminal profiler in the late 19th century, known for his innovative methods in understanding the minds of criminals. Kreizler often employs psychological analysis to solve complex cases, making him a pioneer in the field of criminal psychology. In the story, Kreizler is tasked with investigating a series of gruesome murders in New York City. He collaborates with a team that includes detectives and social reformers, showcasing his commitment to both justice and the betterment of society. His character reflects the early development of forensic science and psychological profiling.