Robert Krulwich is an American radio and television journalist whose specialty is explaining complex topics in depth. He has worked at CBS, Pacifica, and National Public Radio, where he is a correspondent for the science desk. He also co-hosts WNYC’s NPR-distributed scientific documentary series Radio Lab and serves as substitute host on NPR news magazines and talk programs. Since 1994, he has been an ABC News correspondent, appearing regularly on Nightline, World News Tonight, and Good Morning America. He is also a regular correspondent on the PBS investigative series Frontline. He is a graduate of Oberlin College and Columbia Law School.