Emergency Medicine

  Dr. Le is a board-certified Emergency Medicine Physician and will join Mahaska Health in December.  She obtained her medical degree at Wayne state School of Medicine in Detroit, Michigan in 2009 and completed the emergency medicine residency program at Ascension St. John Hospital in Detroit, Michigan in 2012.  Dr. Le became a board-certified emergency…

Deb De Jong

Emergency Medicine

Deborah Nielsen-DeJong, MD, is passionate about her work with emergency medicine. She originally became a provider because she enjoys working with people and problem solving, and she continues to find joy while easing her patient’s fears and providing them with excellent healthcare. Deb approaches each patient as if they were her own family member, ensuring that they get the…

David Cornelder, DO Emergency Room Director

Emergency Room Director

David Cornelder, DO, joined Mahaska Health as the Emergency Room Medical Director in March of 2020, and his calming presence serves as a great asset to the Emergency Services care team. Cornelder is an Oskaloosa native who began his career at Mahaska Health as a respiratory therapist. In 2005, he took a break from respiratory…