About Us

Meet our friendly, experienced pediatricians and staff at West Valley Pediatrics! Our entire team is dedicated to helping you and your child feel at home from the moment you walk through the door. We're proud to be members of the West Valley Community and serve the needs of their children.

We pride ourselves in being an exceptional clinic where children come first. Our child-focused practice works hard to meet the needs of children from infancy through adolescence. Compassionate, knowledgeable and supportive staff is the cornerstone of West Valley Pediatrics's quality care. All of our pediatricians and medical staff are highly trained professionals, and maintain the highest level of accreditation in pediatrics to address the special needs of infants, children, and teens.

We strive to treat each and every patient as we would want our own children to be treated. Our doctors and staff look forward to building a relationship with you and your family.

Gary Berebitsky, MD

Dr Berebitsky grew up in Indiana and graduated from Indiana University with his medical degree. He is a Board Certified Pediatrician and is a Fellow of the American Academy of Pediatrics. His hobbies include sprint triathlons, swimming and traveling. Dr Berebitsky enjoys practicing General Pediatrics.

Colleen Cunningham, MD

Dr. Cunningham grew up in Texas and attended Texas A& M University where she graduated as a member of the Fightin Texas Aggie Class of 1999.  She selected UT Houston for Medical School and moved to Phoenix to do her pediatric residency at Phoenix Childrens' Hospital.  She had intended to return to Texas after residency, but liked Arizona so much she decided to stay.  She has worked at West Valley Pediatrics since graduating from residency.  She and her husband like to hike, kayak and travel. You might even see their family at a Diamondbacks or Coyotes game.

Alan W. Hartsook, MD

Alan W. Hartsook, MD Alan was born in Phoenix, Arizona growing up most of his life here in the Valley of the Sun.  He graduated Summa Cum Laude with his Bachelors of Science in Exercise Physiology from Northern Arizona University, and then completed his Medical Degree at the University of Arizona College of Medicine.  Afterwards, he stayed in the Valley to complete his residency training from Phoenix Children's Hospital/ Maricopa Medical Center Pediatric Residency Program.

Alan's interests include patient advocacy serving as a Board Member of the Arizona Chapter for the American Academy of Pediatrics.  He is also interested in medical education, lecturing for the Midwestern University Physician Assistant Program.

Alan is married to his high school sweetheart and has 2 daughters.

Ekta Bajaj, MD

Dr Bajaj was born in Gilbert, AZ and is an Arizonan native through and through. She graduated from Drexel University with a Bachelor's of Science in Biological Sciences and continued her education at Drexel University College of Medicine. She moved back to the Valley for residency at Phoenix Children's Hospital/Maricopa Medical Center.

In her free time, Dr Bajaj enjoys traveling, enjoying the gorgeous Phoenix weather, and trying new and exotic types of foods. She is excited to serve the West Valley community!

Heather Jacobs, RN, MPH, MSN, CPNP

Heather grew up near Los Angeles, California and attended the University of California at Berkeley for her undergrad and graduate studies in Public Health and research.  After missing the face to face time with children and families, Heather moved to Connecticut for the pediatric nurse practitioner program at Yale University.  Heather chose to move back west for the warm weather and to be close to family in Flagstaff.  Heather enjoys traveling, hiking, swimming, and baking in her spare time.  Her main interests in Pediatrics are Allergy and Asthma, Adolescent Health, and Childhood Obesity.

Jill Purtee, RNP,  CPNP

Jill and her husband moved to Arizona in 2009.  She worked as a Pediatric Nurse Practitioner in Taos, New Mexico and in the Dallas, Texas area.  Prior to becoming a Pediatric Nurse Practitioner, she worked as a Registered Nurse in Pediatrics and Pediatric Intensive Care and was involved in Nursing Education.  She has an affinity for direct patient care and enjoys caring for children of  all ages.  When she isn't working, she likes to travel and spend time with family and friends.  She writes children's stories for fun.

Chelsea Hiemer, CPNP

Chelsea grew up in Lincoln, NE. She graduated summa cum laude with her Bachelors of Science in Nursing from Bryan College of Health Sciences, then completed her Masters of Science in Nursing at the University of Nebraska Medical Center. Before becoming a Pediatric Nurse Practitioner, Chelsea worked as a Registered Nurse in Neonatal Intensive Care. She moved to Arizona in 2017. When she's not working, Chelsea enjoys sewing, baking, traveling, and spending time with family and friends.

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Hours of Operation

Our Regular Schedule


8:00 am-5:00 pm


8:00 am-5:00 pm


8:00 am-5:00 pm


8:00 am-5:00 pm


8:00 am-5:00 pm