Our STAFF

The staff of Southeast Radiation Oncology Center is dedicated to the total well-being of our patients. To contact any of our staff members, click on the "email" link below their biography and we will get back to you within one business day. (Please note: If you have a medical emergency, please call 911 immediately.)


Alex Gonnsen, R.T. (T)

Alex Gonnsen, R.T. (T)

Radiation Therapist

Alex has over five years of experience as a radiation therapist in a rural healthcare setting. He holds an Associate of Science degree in Radiation Therapy from Argosy University. He is certified by the American Registry of Radiologic Technologists.

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Kelly Smelser, MHA, RT(R)(T)

Kelly Smelser, MHA, RT(R)(T)

Lead Radiation Therapist / Department Manager

Kelly has over 10 years of experience in Radiation Therapy, and was previously a Lead Therapist at Emory University. She holds a Bachelor of Science degree in Allied Health/Radiography from East Tennessee State University, a Bachelor of Arts degree from Maryville College in Child Development/Psychology, and a Master of Science degree in Health Administration from the University of St. Francis.

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Mark Winslow, Ph.D., DABR

Mark Winslow, Ph.D., DABR

Director of Physics & Dosimetry

Dr. Winslow has over 10 years of experience in Radiation Oncology, and holds a Doctorate of Engineering Physics from Rensselaer Polytechnic Institute. He is board certified in Therapeutic Medical Physics.

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Heidi Koski, RN

Heidi Koski, RN

Front Office Coordinator / Patient Navigator

Heidi was born and raised in Juneau, AK. She is a Registered Nurse with over six years of experience in the field. She holds an Associate of Applied Science in Nursing, from the UAA School of Nursing, at the University of Alaska in Anchorage.

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Haley Parker

Haley Parker

Billing Team Lead

Haley has an Associate’s degree in General Education with a minor in Psychology. She has served as a Billing Specialist for Radiation Business Solutions, our billing partners, for over two years. Haley is dedicated to providing knowledgeable and compassionate service for patients and their families.

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