Donna Holland, MD, FACP

Residency Program Director

Combined Internal Medicine/Pediatrics

Associate Program Director Pediatrics

Assistant Professor of Clinical Internal Medicine & Pediatrics

A native Texan, Dr. Holland received her medical degree from the University of Texas Health Sciences Center in Houston in 1992.  She came to Phoenix to complete residency training in the Combined Internal Medicine/Pediatrics Program at Good Samaritan Regional Medical Center, and has never made it back to Texas.  She is board certified in both Internal Medicine and Pediatrics.  She is an Assistant Professor of Clinical Medicine at the University Of Arizona College Of Medicine and directs the Combined Medicine/Pediatrics fourth year clinical rotation for medical students.  She is an Associate Program Director for the Pediatrics Residency Program affiliated with Phoenix Children’s Hospital and Maricopa Medical Center.  She is very involved in resident education, junior faculty development projects, and community outreach.

Sarah Beaumont, MD

Division of General Pediatrics & Adolescent Medicine

Phoenix Children’s Hospital

 A native of Illinois, Dr. Beaumont attended medical school at the University of Illinois. She then traveled to Phoenix, Arizona to train in the Combined Internal Medicine/Pediatrics Program at Good Samaritan Regional Medical Center and Phoenix Children’s Hospital. She joined the faculty at both Phoenix Children’s and Good Samaritan where she currently works in the MedPeds continuity clinics, and in the Adolescent Medicine program.  She staffs the Crews‘n Health mobile, a mobile van that provides medical care for homeless adolescents, and organizes the Teen Tot clinic at Phoenix Children’s Hospital.  She is the course director for the Community Pediatrics rotation.  

Randal Christensen, M.D., M.P.H.

Medical Director Crews’N Healthmobile

Medical Director Camp AZDA

Clinical Assistant Professor of Internal Medicine and Pediatrics

Dr Christensen was raised in Tucson, AZ where he earned a B.A. in Sociology from the University of Arizona.  From there he traveled to Boston, MA where entered the MD/MPH program at Tufts University School of Medicine.  Longing for the desert climate, he returned to Phoenix to complete his Medicine-Pediatric residency at the Good Samaritan/Phoenix Children’s Hospital Program.  Upon graduation he took a position as faculty at the two hospitals.  Today Dr Christensen devotes much of his time to medical student and resident education within the program as well as directing the medical aspects of the Crews’N Healthmobile and Camp AZDA.  These last two programs allow medical students and residents the chance to provide healthcare in very unique settings.  The Crews’N Healthmobile offers comprehensive primary care to adolescents and children that are homeless or at high risk.  Camp AZDA is a week long camp that offers children with diabetes the chance to experience summer camp with the necessary medical teams close at hand.  At home one can usually find Dr Christensen playing with his 3 year old twins and his baby girl.

Darren Deering, D.O.

Associate Program Director, Internal Medicine

VA Medical Center

Division of Inpatient Medicine

After receiving his Bachelors of Science degree from Truman State University in 1995, Dr. Deering attended the Kirksville College of Osteopathic Medicine in Kirksville, Missouri.  Following graduation from K.C.O.M. in 1999, he left the Midwest in search of warmer weather.  Unsure of what he wanted to do, he decided to complete a Traditional Rotating Osteopathic Internship in Long Beach, California.  He loved Internship so much, he decided to do another one!  As a result, he moved to Phoenix to become part of the Internal Medicine and Pediatrics Program at Banner Good Samaritan Medical Center & Phoenix Children’s Hospital.   During his last year of residency, he served as a Chief Resident in the program.  Dr. Deering’s primary interest is in resident and medical student education.  He received the Academic Excellence award and the annual Gerald T. Wong, M.D. “I Care” Award while doing his internship in California.  He was recognized by the University of Arizona Medical School student body for excellence in resident teaching and was named “Senior Resident of the Year” in Pediatrics.  Dr. Deering now serves as an Associate Program Director in Internal Medicine and works clinically on the Inpatient Medicine Service at the VA Medical Center.

Michelle Huddleston, M.D.

Adolescent Section Chief at Phoenix Children’s Hospital

Clinical Assistant Professor of Internal Medicine and Pediatrics

A native of North Carolina, Dr. Huddleston received her bachelor’s degree in Biology at East Carolina University in 1990 and remained at East Carolina to receive her Doctorate of Medicine in 1995. She then traveled to Phoenix, Arizona as a newlywed with her husband, Sam.  Michelle completed residency training in the Combined Internal Medicine/Pediatrics Program at Good Samaritan Regional Medical Center and Phoenix Children’s Hospital in 1999. She joined the faculty at both Phoenix Children’s and Good Samaritan where she currently directs the Adolescent program.  Along with Dr. Randy Christensen, she staffs the Crews‘n Health mobile, a mobile van that provides medical care for homeless adolescents. Her care for the homeless extends to a younger population at the Thomas J. Pappas Elementary School, a school based medical clinic for homeless youth.  Her primary focus is adolescent healthcare and resident education. Outside of work she enjoys scrapbooking, rubberstamping, cooking and spending time with her family.

Cheryl W. O’Malley, M.D.

Program Director of Internal Medicine, Banner Good Samaritan Medical Center

Director of Internal Medicine Clerkship for BGSMC, University of Arizona

Dr. O’Malley is a native of Phoenix and left only shortly to complete her bachelor’s degree in Biology at the University of Notre Dame in 1994.  She returned to Arizona to receive her M.D. from the University of Arizona in 1999 and then entered the Combined Internal Medicine/Pediatrics Residency Program at Good Samaritan Regional Medical Center and Phoenix Children’s Hospital.  During her residency, she served as Chief Resident in Pediatrics.   In 2003, she joined the faculty at both Phoenix Children’s and Good Samaritan and currently is the  Program Director in Internal Medicine.  She is the clerkship director for the third year medical students who rotate in Internal Medicine and she is actively involved with the U of A Phoenix campus. Most days, you will find her attending on the inpatient medicine wards and in both Internal Medicine and Pediatric clinics.  She also sees children at the St. Vincent de Paul clinic.   Her primary focus is inpatient adult medicine, resident education, the American College of Physicians, and faculty development programs.  If you come to her house for journal club or a “craft night” you will see that she loves home improvement shows and spending time with her family.

Heather Bartz, D.O.

Assistant Program Director, Internal Medicine

Banner Good Samaritan Medical Center

Dr. Bartz received her undergraduate degree in Biological Sciences from the University of California at Davis in 1997.  She ventured from Northern California to the Midwest for medical school and graduated from Kirksville College of Osteopathic Medicine in 2002.  Many of her medical school clinical rotations were in Phoenix and she fell in love with Arizona as well as the Med-Peds program.  In 2006, she completed the Internal Medicine/Pediatrics Program at Banner Good Samaritan/Phoenix Children’s/Maricopa Medical Center.  During her 4^th year of residency she served as Med/Peds Chief Resident and loved being chief so much she served as an out of training chief resident for both the Internal Medicine and Pediatrics Programs..  In July of 2007, she joined the Internal Medicine/Med-Peds faculty at Good Samaritan/Phoenix Children’s Hospital.  You will find her in many places including the adult medicine inpatient wards and the outpatient medicine, pediatric and adolescent clinics.  Outside of work she enjoys sprint distance triathlons, hiking, and spending time with her husband and 2 Jack Russell Terriers.

Sara C. Stimson, MD

Assistant Program Director, Internal Medicine

Banner Good Samaritan Medical Center

Dr. Stimson received her undergraduate degree in Biological Sciences from the University of the Incarnate Word in San Antonio, Texas in 1996. After teaching high school biology and coaching three sports for a brief stent she travelled to Houston to complete her medical school training at the University of Texas Health Science Center in Houston in 2002.  The Internal Medicine/Pediatrics Program in Phoenix was the main draw out of Texas and she completed her combined training at the the Internal Medicine/Pediatrics Program at Banner Good Samaritan/Phoenix Children's/Maricopa Medical Center in 2006.  Her love for teaching continued as a combined Internal Meidicine/Pediatric Chief Resident which she completed in 2007.  She now has joined the Internal Medicine/Med-Peds faculty at Banner Good Samaritan/Phoenix Children's Hospital where she spends time in both the outpatient and inpatient settings and continues to remain dedicated to the growth and development of young physicians and medical students.  Outside of work she enjoys spending time with her partner, 2 dogs and cat, listening to music and hiking.

Tressia Shaw, M.D.

General Pediatrics Division

Phoenix Children’s Hospital

Dr. Shaw completed an undergraduate degree at the University of Minnesota before relocating to warmer weather at University of Arizona College of Medicine, where she received her Doctorate of Medicine degree.  In 2004, she completed her training in Internal Medicine/Pediatrics at Good Samaritan Regional Medical Center and Phoenix Children’s Hospital.  During her fourth year of residency, she served as Med/Peds Chief Resident.  She is now a member of the faculty in the General Pediatrics Division at Phoenix Children’s Hospital.  She has a focused interest in caring for children and adolescents with special health care needs and issues of transitioning this population to adult health care.  Currently, she directs a clinic for children with special health care needs, including a transition clinic funded by an AAP CATCH grant.  During her residency, she developed an educational curriculum in this area for the pediatric residents.  This curriculum was presented at the 2004 AAP National Medical Home and Children with Special Health Care Needs Conference.  She is developing a palliative care program at PCH and is a medical director with Hospice of the Valley's pediatric hospice program.  In her free time she enjoys running, hiking, and swimming.

David Carl Houghton, MD

Med/Peds Faculty

Banner Good Samaritan Medical Center

Dr Houghton grew up in the beach communities of Orange County, California. He graduated from UC Irvine with a BS in biology in 1992 after serving for two years as a missionary in the Spanish-speaking towns of the Rio Grande Valley. He was then commissioned as an officer in the US Public Health Service and attended medical school at the Uniformed Services University in Bethesda, Maryland.  After receiving his MD degree in 1996, he completed a med-peds residency at Good Sam/Phoenix Children’s, serving as pediatric chief resident from 1999-2000. Since then he has practiced full spectrum primary care for the underserved in the Salt Lake City area, frontier emergency medicine in arctic Alaska, and community hospital medicine/critical care at Phoenix Indian Medical Center.  He served in the National Health Service Corps program for disaster preparedness and is now part of the Air Force Reserve’s aerospace medicine program.  He has served as medical school faculty for the University of Utah and currently teaches at the University of Arizona.  He engages part-time in pediatric urgent care for Phoenix Children’s Hospital and Good Night Pediatrics, as well as inpatient/nursery care at Banner Cardon Children’s Hospital.  In addition to working full-time on Good Sam’s inpatient teaching service, he is involved with Banner’s critical care telemedicine program.  He and his wife stay busy raising four teenagers.  He enjoys outdoor activities, photography and video production.

Paul Tafoya, MD

Department of Pediatric Critical Care

Phoenix Children's Hospital

Dr. Tafoya earned his medical degree at the Ohio State University College of Medicine in Columbus, OH.  He then completed 4 years of training in the Combined Internal Medicine/Pediatrics residency program sponsored by Banner Good Samaritan Regional Medical Center.   After his residency, Tafoya went on to complete his Fellowship in Pediatric Critical Care at the Children's Hospital of Los Angeles in Los Angeles, CA.  He is certified by the American Board of Pediatrics.   He has now returned to Phoenix and to Phoenix Children’s Hospital to work in the Sybil B. Harrington Pediatric Intensive Care Unit. 

Elizabeth Zorn, MD

Director Pediatric Critical Care

Phoenix Children's Hospital

Dr. Zorn received her medical degree from the University of South Dakota School of Medicine in Vermilion, South Dakota.  She completed a residency in both Pediatrics and Internal Medicine at Banner Good Samaritan Regional Medical Center in Phoenix, Arizona.  She completed her fellowship in Pediatric Critical Care Medicine at LeBonheur Children’s Medical Center in Memphis, Tennessee.  Dr. Zorn is the Medical Director for the Division of Critical Care.  Dr. Zorn has been practicing pediatric critical care medicine for 9 years.

Adrian O’Hagan, MD

Assistant Director of Adult Cystic Fibrosis Center

Department Pediatric Pulmonology

Phoenix Children's Hospital

Dr. O’Hagan attended Queens University Faculty of Medicine in Kingston, Canada.  He then completed residency training in Internal Medicine & Pediatrics at the Cleveland Clinic Foundation in Cleveland, Ohio.  He trained as a pediatric Pulmonary Fellow at Washington University/St. Louis Children’s Hospital in St. Louis, MO.  He is board certified in Internal Medicine, Pediatrics, and Pediatric Pulmonology.  He is starting his third year at Phoenix Children’s Hospital.  His work encompasses all of pediatric pulmonary with particular interest in cystic fibrosis and swallowing disorders.  He is the Director of the Pediatric CF Center, and the Assistant Director of the Adult CF Center.

Tala Dajani, MD

Department Pediatric Endocrinology

Phoenix Children's Hospital

Dr. Dajani joined the Phoenix Children’s Hospital Division of Endocrinology in 2005.  She currently serves as Medical Director of Phoenix Children's Diabetes Center and Healthy Start, a clinic for children with the metabolic syndrome.  She has developed a young adult diabetes transition clinic to age 25 years.  She has a special interest in children and adults with endocrine effects of cancer therapy and in children and adults with cystic fibrosis related diabetes. 

Gerry Gong, MD

Director of Adult Cystic Fibrosis Center

Department Pediatric Pulmonology

Phoenix Children's Hospital

Dr. Gong is the Director of the Adult Cystic Fibrosis Center and the Apnea Management Program at Phoenix Children’s Hospital.  He attended medical school at Loyola University of Chicago Stritch School of Medicine in Maywood, IL.  He then trained in Internal Medicine & Pediatrics at Banner Good Samaritan Regional Medical Center, and then left to completed his fellowship in Pediatric Pulmonology at The Children's Hospital of Los Angeles in Los Angeles, CA.  He is certified by the American Board of Internal Medicine, the American Board of Pediatrics, and the American Board of Medical Specialties in Pediatric Pulmonary Medicine.