Advanced Registered Nurse Practitioner
Alicia Knox, ARNP
Alicia Knox, ARNP-BC. To schedule an appointment with Alicia Knox, ARNP-BC, please call Mahaska Health at 641.672.3360. Specialties Walk-In Clinic Education Graceland University: Bachelor of Science in Nursing; Masters of Science in Nursing Board Status Board of Nursing Professional Associations American Nurse Credentialing Center ANCC Board Certification
Tonya Horn, ARNP
Walk-In Clinic, Pediatrics & Primary Care
Tonya Horn – ARNP. Tonya was born and raised in Iowa as an Oskaloosa native. She will begin serving patients at Mahaska Health as a Pediatric Nurse Practitioner after years of providing care for the community in our Emergency Room as an RN. Tonya started her nursing career in a Pediatric Intensive Care Unit and…
Heidi Powers, ARNP, NP-C
Heidi Powers, ARNP, joined the Mahaska Health Walk-In Clinic Care Team in February 2021. She is happy to be back home in this community, as her hometown is Barnes City, Iowa. Heidi earned her Master of Science in Nursing (Family Practice) through Clarkson College in Omaha, Nebraska, and is certified through the American Academy of…
Arthur Zacharjasz, ARNP-BC
Walk In Clinic, Pulmonology, Occupational & Employee Health
Arthur grew up in Illinois and spent the last 5 years as an intensive care unit nurse at Northwestern Memorial Hospital in Chicago. Arthur graduated with honors from DePaul University with a Master of Science in nursing and went on to earn his Advanced Registered Nurse Practitioner license from North Park University School of Nursing.…
Leah VanLoon, ARNP
Family Practice & Walk-In Clinic
Leah VanLoon, ARNP serves as a provider for the Walk-In and Primary Care clinics at Mahaska Health. VanLoon is from the Eddyville area and joined Mahaska Health with 16 years of prior nursing experience, most recently having worked as a Nursing Supervisor at ChildServe in Johnston, Iowa. She began her nursing education at Indian…
Jessica Tokle, ARNP
Family Nurse Practitioner Jessica Tokle decided to go into medicine because she enjoys helping patients and learning from them. Originally from Grinnell, Jessica is excited to be close to home again. During her first year of college, she discovered her passion for nursing and decided to obtain her masters in nursing. Jessica received her Family…
Anna Throckmorton, ARNP
Anna Throckmorton, ARNP began serving as a nurse practitioner at Mahaska Health in September 2019. For many patients, Anna will be a familiar face as she has been a part of the Mahaska Health family for the past 15 years serving in various capacities, most recently as a registered nurse in the Birthing Center. Anna,…
Tara Stout, DNP, ARNP
Tara Stout, DNP, ARNP joined Mahaska Health in December 2019 after receiving her Doctorate of Nursing Practice from Clarke University in Dubuque, Iowa. Many may know her as she spent some time at Mahaska Health during her clinical rotations with Dr. O'Brien and Tonya Johannes. Tara grew up in Sully, Iowa and lives on a…
Lisa Nelson, ARNP-C
Lisa Nelson, ARNP, provides Geriatric and Skilled Nursing care at Mahaska Health. For Lisa, she was led to providing geriatric care while she was completing her nurse practitioner degree at the University of Iowa in 2003. Her grandmother received care at a long-term care facility, and she realized quickly that she wanted to provide this…
Melissa Lamb, ARNP
Allergy/ Immunology/ Pulmonology
Melissa Lamb, ARNP specializes in the areas of allergy, immunology and pulmonology and has been with Mahaska Health since 2006. Lamb joined the team at Mahaska Health after 5 years of extensive pulmonary specialty experience at Mayo Clinic in Rochester, Minnesota. Melissa can empathize with patients because she has been on the patient side of…