Imelda Muller

Imelda Muller is an American physician, former United States Navy officer, and NASA astronaut candidate. She was selected in 2025 as a member of NASA Astronaut Group 24, NASA's 24th astronaut candidate class. She reported for duty in September 2025 to begin two years of astronaut candidate training.

Early life and education Muller was born in Mineola, New York, and considers Copake Falls, New York, her hometown.

She earned a bachelor's degree in behavioral neuroscience from Northeastern University and received a medical degree from the University of Vermont College of Medicine in 2017. She completed a transitional-year residency internship at Naval Medical Center San Diego in 2018 and an anesthesia residency at the Johns Hopkins School of Medicine in 2025.

NASA career NASA announced Muller as one of ten members of its 2025 astronaut candidate class on September 22, 2025. Muller began astronaut candidate training in September 2025, a program intended to prepare candidates for possible future flight assignments to low Earth orbit, the Moon, and Mars.

Awards and honors Muller's honors include the Department of the Navy's Dr. Delores M. Etter Top Scientists and Engineers of the Year Award, the Johns Hopkins Resident Teaching Award, two Navy and Marine Corps Commendation Medals, the Commander Wayne Horn Honorman Award from the Naval Undersea Medical Institute, the Global Health Reflections Award from the University of Vermont College of Medicine, and recognition as class marshal at Northeastern University.

Personal life NASA lists Muller's personal interests as hiking, endurance sports, scuba diving, and home renovation projects. While on active duty, she competed as an elite triathlete on the U.S. Military Endurance Sports team and was a member of the All-Navy Triathlon team in 2022.