About Our Providers

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Ethan Hoerschgen, MD

A native of Springfield, Dr. Ethan Hoerschgen has been providing exceptional care to his patients since 2010. He attended medical school at Saint Louis University School of Medicine. He completed an internal medicine residency followed by fellowship training at Barnes – Jewish Hospital with Washington University.

Dr. Hoerschgen is highly regarded in his profession. He is Board Certified in Internal Medicine as well as in Nephrology. He shares his knowledge with other professionals, lecturing as a guest to Missouri State University’s Physician’s Assistant students.

To stay abreast of the latest advancements in nephrology, Dr. Hoerschgen maintains memberships in the American Society of Nephrology, Renal Physician Association and the National Kidney Foundation.

In his free time, Dr. Hoerschgen enjoys volunteering with the Heart of the Ozarks Sertoma Club and playing golf.

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Susan Woody, DO

Since 2002, Dr. Susan Woody has been offering exceptional nephrological care. She attended medical school at the University of Health Sciences/College of Osteopathic Medicine (UHS-COM) in Kansas City, Missouri. She completed her residency with the University of Missouri – Kansas City and her fellowship training with the University of Kansas.

Dr. Woody is board certified by the American Board of Internal Medicine in Nephrology. She stays up-to-date with her field by holding memberships in the American Society of Nephrology, Renal Physician Association and the Greene County Medical Society.

In 2009, 2010 and 2011, Dr. Woody was recognized as a runner-up for Top Doctor in Nephrology by 417 Magazine.

When not at the office, Dr. Woody has a passion for animal rescue, and she has volunteered with the Best Friends Animal Sanctuary in Utah. She also enjoys fitness, fishing and spending time with her family: her husband Greg Dodson, an image consultant, and her step-son.

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David Sommerfeld, MD

Dr. David Sommerfeld has been in practice since 1992. Highly educated, he obtained his Bachelor of Science degree from Kansas State University and earned his medical degree from the University of Kansas. He completed his internal medicine residency and his nephrology fellowship with the University of Iowa.

Board certified, Dr. Sommerfeld maintains memberships in many professional organizations. He is currently a member of the American Society of Nephrology and the Renal Physician Association.

In 2009, Dr. Sommerfield was recognized as a runner up for Top Doctor in Nephrology by 417 Magazine. He was recognized as a Top Doctor in 2010 and 2011.

Dr. Sommerfeld gives back to his local community by volunteering with The Kitchen Clinic, which provides health services to underprivileged families. He also participates in Kiliclimb, a fundraiser to bring clean drinking water to African villages.

In his spare time, he enjoys watching college football and basketball.

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Stephen Garcia, MD

For 20 years, Dr. Stephen Garcia has given outstanding care to his loyal patients. Well trained, he earned his medical degree from the University of Missouri – Columbia. He completed his internal medicine residency at the Medical College of Virginia and his fellowship in nephrology at Indiana University.

Board certified in nephrology, Dr. Garcia is a member of the American College of Physicians, American Society of Nephrology and the National Kidney Foundation. In 2010, Dr. Garcia was recognized as a Top Doctor in Nephrology by 417 Magazine.

Dr. Garcia participates in the Global Brigades, which are medical mission trips. He is married with three children, and he enjoys fly fishing, cycling and running in his spare time.

Giselle D. Kohler, MD

Dr. Giselle Kohler joined Springfield Nephrology Associates in 2015. She received a Bachelor of Arts from the University of Pennsylvania and her medical degree from the University of Maryland. She completed her internal medicine training at the University of Texas Southwestern and Parkland Hospital in Dallas. Dr. Kohler then finished her nephrology fellowship at Washington University in St Louis and Barnes Jewish Hospital.

Board certified in internal medicine and nephrology, Dr. Kohler is a member of the American Medical Association, American Society of Nephrology and the National Kidney Foundation. She has presented at the American Society of Nephrology annual meeting and been published in medical journals, including Kidney International and American Journal of Kidney Disease.

Throughout her training, Dr. Kohler developed an interest in complex ethical questions that arise during the care of patients and with advances in modern medicine. She completed a certificate of advance study in bioethics and health policy through Loyola University in Chicago. She was an active member of the ethics consultation team at Washington University St Louis during her nephrology fellowship.

She is passionate about the study of kidney disease and takes pride in caring for patients and working with their families throughout the patient’s entire course of kidney disease.

Dr. Kohler resides in Springfield with her family. She enjoys hiking with her dog, traveling with her family, and volunteering with a variety of community organizations in the Ozarks.

Nurse Practitioners

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Catherine York, APRN, BC

Catherine York had been in the nursing field since 2003, and has practiced as a nurse practitioner since 2005. She obtained her Bachelor of Science in Nursing from the University of Arkansas in Fayetteville. She then furthered her education and earned a Master of Science in Nursing from Missouri State University.

Board certified by the American Nurses Credentialing Center, Catherine feels it is important to stay up-to-date with the latest in her field. Thus she maintains memberships in professional organizations, including the National Kidney Foundation.

In 2011, Catherine was honored by the Springfield Business Journal with the Salute to Healthcare Award in the Nurse Practitioner category. She is also a CPR instructor and teaches CPR to the entire staff each year.

In her spare time, Catherine volunteers in her community. She is a member of the Junior League which focuses on child abuse prevention and supports Isabel’s House, a crisis nursery. She also enjoys cooking, taking pictures, traveling and being with her family.

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Michelle Homesley, APRN, BC

Michelle Homesley has been practicing since 2009. She earned both her Bachelor of Science in Nursing and her Master of Science in Nursing from the University of Missouri – Kansas City.

Michelle is board certified by the American Nurses Credentialing Center, and she holds her Missouri State Nursing License. She is also a member of the American Academy of Nurse Practitioners.

When not at the office, Michelle likes to travel, read, shop and play with her dogs!

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Brad Gillespie, APRN, BC

Brad Gillespie joined Springfield Nephrology Associates in August of 2014. He is a native of Marionville, MO, and currently resides in Springfield. He is a 1999 graduate of St. John’s College of Nursing and obtained his BSN degree from Southwest Baptist University in 2003. He received his Master of Science in Nursing from the University of Missouri – Kansas City in 2008.

He is board certified by the American Academy of Nurse Practitioners (AANP). He is a member of the AANP and National Kidney Foundation.

He has been married to his wife, Sarah since 2005. They enjoy riding their horses, spending time with their dogs and antiquing. Brad enjoys running, reading, and college basketball. Brad and Sarah have volunteered with the Springfield Street Project, providing coats, and hygiene supplies to Springfield’s homeless population. They have also donated to Isaiah 61, a mission group in Haiti providing Bibles to Haitian citizens.

Amanda McCreary, MSN, NP-C

Mandy joined Springfield Nephrology Associates in September 2016. She is a native of Kimberling City, MO and has been in the nursing field since 2002. She obtained her Bachelor of Science in Nursing from Southwest Bolivar University in Bolivar, MO in 2007. She then furthered her education and earned a Master of Science in Nursing from Maryville University in St. Louis.

Board certified by the American Academy of Nurse Practitioners (AANP), Mandy feels it is important to stay up-to-date with the latest in her field. Thus she maintains memberships in many professional organizations, including the National Kidney Foundation and AANP.

In her spare time, Mandy likes to read, travel and spend quality time with her family.

Travis Young, MSN, NP-C

Travis joined Springfield Nephrology Associates in October 2016. He is a 2014 graduate of St. Joseph’s College of Maine where he received his Masters of Science in Nursing: Family Nurse Practitioner (MSN). Prior to receiving his MSN, he earned a Bachelor of Science degree in Nursing from Cox College of Nursing in 2011 and a Bachelor of Arts degree in Biology from Drury University.

He is board certified by the American Academy of Nurse Practitioners (AANP). He is also a member of the AANP and the National Kidney Foundation.

In his spare time, Travis enjoys music, playing guitar and spending time outdoors.

Springfield Nephrology Associates

  • Springfield Location - 1911 S. National Ave., Springfield, MO 65804 Phone: 417-886-5000 417-886-5000
  • Bolivar Location - 1165 N. Butterfield Rd., Suite B1, Bolivar, MO 65613 Phone: 417-886-5000
  • Lebanon Location - 341 Hospital Dr., Suite 300, Lebanon, MO 65536 Phone:
  • West Plains Location - 803 W. Broadway St., West Plains, MO 65775 Phone:
  • Mountain Grove Location - 1206 N. Main Ave., Suite B, Mountain Grove, MO 65711 Phone:
  • Aurora Location - 500 Porter Ave., Aurora, MO 65605 Phone: 417-886-5000

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