6435 S. FM 549, Suite 201, Heath, TX 75032

(214) 771-3712

Pediatric & Adolescent Specialists of Rockwall

Welcome to Pediatric & Adolescent Specialists of Rockwall.

Our Physicians


Christopher Becker, M.D.


Dr. Becker was born and raised in Columbus, Ohio. He graduated from the Ohio State University College of Medicine in 1996. He obtained his residency training at Texas Tech University Health Sciences Center and was Board Certified in Pediatrics upon completion in 1999.

Dr. Becker ran a solo private practice for 2 years in Colorado before joining a pediatric group practice in Dallas, where he practiced for seven years. He enjoys all aspects of general pediatrics with a special interest in infectious disease processes and preventative care issues.

He currently lives in Rowlett with his wife and son.

Medical School: The Ohio State University College of Medicine
Residency: Texas Tech University Health Science Center


Rana Pascoe, M.D.


Dr. Pascoe obtained her undergraduate degree at Chapman College, California and her medical degree from the University of Southern California. She completed her residency in family medicine at Kaiser Hospital in California, followed by a specialty fellowship in adolescent medicine at Children's Hospital of Los Angeles.

In November 2001, Dr. Pascoe became one of fewer than 100 family physicians in the country to pass the Adolescent Medicine Board examination. Dr. Pascoe enjoys seeing babies and young children, as well as teens and young adults.

She lives in East Dallas with her husband, John, and her three children.

Medical School: University of Southern California
Residency: Kaiser Hospital, Fontana, CA
Fellowship: (Adolescent Medicine) Children's Hospital, Los Angeles


Gregory Sonnen, M.D.


Dr. Sonnen is a Texas native, growing up in the San Antonio area. He received an undergraduate degree in microbiology from Texas A&M University in 1991. He followed that with an M.D. from Texas A&M Health Science Center in 1995. Dr. Sonnen completed his residency training in Pediatrics at the Mayo Clinic in Rochester, Minnesota. While there, he authored several book chapters involving the treatment of infectious diseases in children.

After training, Dr. Sonnen was board certified in General Pediatrics. He returned to Texas in 1998 and joined a large group practice in Mesquite where he practiced pediatrics for 11 years. He also received a faculty appointment to The University of Texas Southwestern Medical School, where he taught medical students the fundamentals of pediatric care for 11 years. His special area of interest is childhood vaccine advocacy.

Dr. Sonnen is a long time resident of Rockwall. He is married with two children.

Undergraduate: B.S. in Microbiology, Texas A&M University
Medical School: Texas A&M University Health Science Center, College of Medicine
Residency: Mayo Clinic, Rochester, MN

Our Nurse Practicioner


Hillary Mueller, R.N., M.S.N., C.P.N.P.-P.C.


Hillary Mueller is a certified pediatric primary care nurse practitioner committed to the health of Rockwall’s youngest residents. She graduated summa cum laude from Texas Woman’s University in Dallas with a bachelor’s degree in nursing. She later went back to school to earn her master’s degree in nursing from St. Louis University.

Hillary has nearly a decade of experience that encompasses work in neonatal intensive care nursing at Texas Health Resources facilities in Allen and Dallas, developmental pediatrics, pediatric primary care in Wylie and elementary school nursing for the Dallas Independent School District. She is passionate about educating parents on children’s developmental milestones, prevention-based health care strategies and home treatment plans that promote wellness.