Mercy Health System Family Practice Faculty
James Horton, MPH, MD
Program Director - Family Medicine Residency Program
 Dr. Horton earned his medical degree at the University of Texas Medical School, Houston, as well as a Master of Public Health degree at the University of Texas School of Public Health at Houston. He is certified by the American Board of Family Medicine. With a passion for teaching residents, Dr. Horton serves on the faculty as the director of the Mercy Health System Family Medicine Residency Program. Complimented as genuinely caring for his patients, he teaches residents to connect and counsel well with patients, as well to become highly competent physicians. In his spare time, he enjoys photography and mission work.
Rex Kolste, MD, FAAFP
Associate Director - Family Medicine Residency Program
 Dr. Kolste earned his medical degree from the University of Nebraska Medical Center in Omaha and completed his family practice residency at Wesley Medical Center in Wichita, Kansas. He is certified by the American Board of Family Practice and is a certified instructor for Advanced Life Support in Obstetrics. In 2003 the Wisconsin Academy of Family Physicians named him Family Medicine Educator Of The Year.
Dr. Kolste’s practice interests include the entire scope of primary care. He is considered the clinic’s procedure guru. His interests outside of medicine include farming, arboriculture and woodworking. He practiced in Colby, Kansas before joining the Mercy faculty in 1994.
Arthur Altbuch, MD, FAAFP
Director - Sports Medicine Fellowship Program
 Dr. Altbuch earned his medical degree from Albany Medical College in Albany, New York and completed his family practice residency at Bayfront Medical Center in St. Petersburg, Florida. He is certified by the American Board of Family Practice and holds certificates of added qualification in geriatrics and sports medicine.
Dr. Altbuch practiced family medicine and gerontology in Florida and served on a residency faculty in Tallahassee, Florida before joining the Mercy faculty in 2000. In his spare time Dr. Altbuch enjoys antique clock repair and marathon running.
Rebecca Beach, MD, FAAFP
 Dr. Beach earned her medical degree from the University of Chicago, Pritzker School of Medicine and completed her residency at Lutheran General Hospital in Park Ridge, Illinois. She is certified by the American Board of Family Practice and is a certified instructor for Advanced Cardiac Life Support and Advanced Life Support in Obstetrics.
Interests include family-centered obstetrics, pediatrics, migraines, outpatient procedures, and teaching residents, students and nurses. Dr. Beach was on the faculty of Union Hospital Family Practice residency in Terre Haute, Indiana prior to moving with her family to Janesville in September, 2003. She enjoys reading science fiction and gardening.
Steve Bartz, MD, FAAFP, RPh
 Dr. Bartz earned his medical degree and completed his residency and fellowship at the University of Cincinnati College of Medicine. He is certified by the American Board of Family Medicine with a Certificate of Added Qualification in geriatric medicine. Dr. Bartz is also a registered pharmacist. Prior to joining Mercy, Dr. Bartz was an Assistant Professor of Family Medicine at the University of Cincinnati for 6 years.
Dr. Bartz is especially interested in inpatient medicine, geriatrics, and medicolegal aspects of medicine. His hobbies include Boy Scouting and he is a Master Gardener.
Gerry Greenfield, PhD (Psychologist)
 Dr. Greenfield was born and raised in New York City. He received his BA from Princeton University, and his PhD in clinical psychology from the University of Colorado, Boulder, in 1988. He subsequently worked part time for nine years for the Wisconsin Department of Corrections, where he did his PhD internship. Dr. Greenfield has also maintained a private practice in and around Madison since 1989, using an eclectic therapeutic approach with individuals and couples with a wide range of presenting problems. He joined the Mercy Health System Family Medicine Residency Program faculty in January 2003. He is credentialed by the National Register of Health Service Providers in Psychology and holds a Certificate of Professional Qualification in Psychology from the Association of State and Provincial Psychology Boards. Dr. Greenfield is an avid road bicyclist and skier (cross-country, and downhill when he can get to the Rockies), occasional scuba diver, beach and travel lover, sometime sports fan, and full-time husband and step-dad.
William Winkler, MD, FAAFP
 Dr. Winkler earned his medical degree from St. Louis University School of Medicine and completed a family practice residency at. St. John’s Mercy Medical Center in St. Louis. He is certified by the American Board of Family Practice and is a certified instructor for Advanced Life Support in Obstetrics, which he taught in Kyrgyzstan in October, 2003.
Dr. Winkler’s practice interests include maternal and child care, appropriate use of antibiotics, medical computing and medical ethics. His interests outside of medicine include birding, woodworking, cooking and computer graphics. He practiced in the St. Louis area for 18 years and served on the faculty of the University of Texas family medicine residency in Conroe, Texas prior to joining Mercy Health System in October, 2000.
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