We’re here for you when you need us.We’re here for you when you need us.Visit one of our clinics near you.Our caring staff is here to serve you.Attend one of our events or classes.Join our team of caring professionals.We’re here for you when you need us.

Visiting Specialty Clinic
210 4th Ave., Grinnell
641-236-2925

Visiting Specialists
Please contact GRMC’s Visiting Specialty Clinic by e-mail or by calling 641-236-2925 for information on these specialists. (Inital appointments should be scheduled through a family physician or in the case of Dr. Davison, your optometrist.)
Allergy/Immunology/Pulmonology | Audiology | Cardiology | Dermatology | ENT | Neurology | Oncology | Ophthalmology | Physical Medicine and Rehabilitation | Pulmonology
Allergy/Immunology/Pulmonology
Michael M. McCubbin, MD
Board Certification: Allergy, Immunology, Pediatic Pulmonology, and Sleep Medicine
Scope of Practice: Allergy/Immunology/Pulmonology/Sleep Medicine
Medical School: University of Iowa, College of Medicine • Pediatric Allergy-Pulmonary Fellowship, University of Iowa
Residency: University of Iowa Hospitals and Clinics
Affiliation: Private practice, Michael McCubbin, MD, PC
How to reach him: Michael McCubbin, MD, PC • 641-621-1487
Audiology
Dotty J. Walters, AuD
Scope of Practice: Audiology
Medical School: University of Florida, Colleges of Health Professions and Liberal Arts and Sciences
Affiliation: Woodard Hearing Services
How to reach her: Woodard Hearing Services • 641-236-5650 
Dean J. Kayser, AuD
Scope of Practice: Audiology
Medical School: Central Michigan University
Residency: Chicago College of Osteopathic Medicine, Chicago, IL
Affiliation: Kayser Hearing Aid and Audiology
How to reach her: Kayser Hearing Aid and Audiology • 641-236-6676 
Cardiology
David W. McAllister, DO
Board Certification: Cardiology and Interventional Cardiology
Scope of Practice: Coronary and Peripheral Vascular Intervention
Medical School: Des Moines University, Osteopathic Medical Center
Residency: Iowa Methodist Medical Center • Cardiology Fellowship, University of Missouri Hospitals and Clinics, Columbia, MO • Interventional Cardiology Fellowship, Iowa Heart Center
Affiliation: Iowa Heart Center
How to reach him: Iowa Heart Center • 888-591-9247 
Mark D. McGaughey, MD
Board Certification: Cardiology and Interventional Cardiology
Scope of Practice: Clinical and Interventional Cardiology, and specializing in Valvuloplasty
Medical School: Johns Hopkins University School of Medicine
Residency: Johns Hopkins Hospital
Affiliation: Iowa Heart Center
How to reach him: Iowa Heart Center • 888-591-9249 
Teresa Sieck, PA-C
Board Certification: Physician Assistant
Scope of Practice: Cardiology
Medical School: Des Moines University
Affiliation: Iowa Heart Center
How to reach her: Iowa Heart Center • 515-633-3600 
Dermatology
Hobart W. Walling, MD, PhD
Scope of Practice: Dermatology
Medical School: St. Louis University, St. Louis, MO
Residency: University of Iowa Hospitals and Clinics
Affiliation: Town Square Dermatology
How to reach him: GRMC Visiting Specialty Clinic • 641-236-2925
Ear, Nose, and Throat
Jeremy D. Vos, MD
Board Certification: Otolaryngology
Scope of Practice: Ear, nose, throat, and plastic surgery
Medical School: Washington University School of Medicine, St. Louis, MO
Residency: Vanderbilt University, Nashville, TN
Affiliation: Otologic Medical Services
How to reach him: Otologic Medical Services • 800-642-6217
Neurology
Edward A. Aul, MD
Board Certification: Neurology
Scope of Practice: Neurology
Medical School: University of Pittsburgh School of Medicine, Pittsburgh, PA
Residency: University of Iowa Hospitals and Clinics• Clinical Neurophysiology Fellowship, University of Iowa Hospitals and Clinics
Affiliation: University of Iowa Healthcare
How to reach him: University of Iowa Healthcare• 319-365-2580 
Oncology
Steven P. Heddinger, MD
Board Certification: Internal Medicine
Scope of Practice: Oncology
Medical School: University of Iowa, College of Medicine
Residency: University of Iowa Hospitals and Clinics • Hematology-Oncology Fellowship, Medical College of Virginia, Richmond, VA
Affiliation: Medical Oncology and Hermatology Associates
How to reach him: GRMC Visiting Specialty Clinic • 641-236-2925 
Ophthalmology
James A. Davison, MD
Board Certification: Ophthalmology
Scope of Practice: Cataract and Refractive Surgery
Medical School: Mayo Clinic Medical School, Rochester, MN
Residency: Mayo Graduate School of Medicine, Rochester, MN
Affiliation: Wolfe Clinic
How to reach him: Wolfe Clinic • 641-754-6200 
Physical Medicine and Rehabilitation
Marvin M. Hurd, MD
Board Certification: Physical Medicine and Rehabilitation
Scope of Practice: Physical Medicine and Rehabilitation
Medical School: University of Iowa, College of Medicine
Residency: Riverside Methodist Hospital and Ohio State University Hospitals, Columbus, OH
Affiliation: Private practice, Marvin Hurd, MD
How to reach him: GRMC Visiting Specialty Clinic • 641-236-2925 
Pulmonology/Sleep Disorders
Steven K. Zorn, MD
Board Certification: Pulmonary Disease
Scope of Practice: Pulmonology
Medical School: University of Wisconsin, Milwaukee, WI
Residency: Cleveland Clinic Hospital, Cleveland, OH• Pulmonary Medicine Fellowship, Yale University Medical School, New Haven, CT
Affiliation: Iowa Sleep Disorders Center
How to reach him: GRMC Visiting Specialty Clinic • 641-236-2925