Hospitalist, Inpatient Medicine

Dr. Kyle Witt – Hospitalist – Inpatient Physician. Dr. Witt completed his residency at the University of Arizona, and serves as a Hospitalist on our Inpatient Department. His professional interests and clinical expertise lie in the areas of public health and geriatric care. Dr. Witt truly has a heart for people and that has driven…

Surgery Medical Director, General Surgeon

Dr. Jesse Van Maanen is a board-certified general surgeon providing individualized, comprehensive surgical care with a focus on minimally invasive techniques when appropriate.

Family Medicine, Obstetrics

Hannah Thompson is serving Mahaska Health as a Family Practice and Obstetrics Physician. Having grown up in the Midwest, Hannah is excited to begin serving Oskaloosa and the surrounding communities. Dr. Thompson treats her patients as she would treat her closest family members, bringing a down- to-earth, honest and communicative environment to the room. Having…

Family Medicine

Dr. Preston Sereg, Family Medicine Physician serves the Mahaska Health community as a Family Medicine Physician. Dr. Sereg was born and raised in Oskaloosa and has worked in healthcare for the past 9 years. Dr. Sereg chose to practice at Mahaska Health because he wanted to take part in and give back to the community…

Mark Zacharjasz, MD

Medical Weight Loss and Hospice

Mark Zacharjasz, MD, Family Medicine Physician believes in offering his patients the best possible treatments and advice while upholding their values and autonomy.