Jen Arnold

Jen Arnold is a board-certified neonatologist and pediatrician who works as an attending physician at Boston Children's Hospital, where she leads the Simulation Program, and is a faculty member at Harvard Medical School. She earned her medical degree from the Johns Hopkins University School of Medicine and a master's degree in medical education from the University of Pittsburgh, and was previously medical director of the Simulation Center at Johns Hopkins All Children's Hospital in Florida. For more than a decade she co-starred in The Little Couple on TLC, and she is also a New York Times best-selling author, motivational speaker and podcaster whose work includes Boston Children's Answers: Kids' Health. Her YouTube channel, JenniferArnoldMD, had about 36,000 subscribers in December 2025.