Dr. Onhaizer (known to many patients as Dr. O) was born in South Houston, only minutes away from Pearland Pediatrics, and grew up in Tomball, Texas. He received his undergraduate and medical degrees at Texas A & M University. He returned to his hometown to complete his pediatric residency with Baylor College of Medicine. During those three years he also trained in general pediatrics at Pearland Pediatrics. Dr. Onhaizer is a member of the American Medical Association, American Academy of Pediatrics, and the Texas Medical Association.