About Dr. Ponce de Leon

Dr. Hillery will be retiring at the end of 2023, after 38 years of practice in the Richmond/Rosenberg, Katy, and greater Houston area. He has enjoyed working in this community and with his hospital colleagues throughout these years. Dr. Hillery is thankful for the trust and confidence of the many patients he has had the pleasure to serve over the past three decades. Dr. Hillery joined Southwest Surgical Associates in 1994, with four other surgeons. Dr. Hillery has enjoyed the experience of working with many excellent colleagues through the years as Southwest Surgical Associates has grown.
In retirement Dr. Hillery is looking forward to spending more time with his growing group of grandchildren.
Guillermo Ponce De Leon
About Dr. Ponce de Leon

Guillermo Ponce de Leon, MD, FACS, is a skilled general and bariatric surgeon at Southwest Surgical Associates. He is proud to serve patients in Sugar Land, Texas, and throughout the greater Houston area.

Dr. Ponce de Leon, a native of Cuba, earned his Bachelor of Biochemistry at Houston Baptist University in Texas. He then moved on to medical school at the University of Texas at Houston, completing a transitional internship and earning his doctorate in medicine. For his residency, Dr. Ponce de Leon moved to Dallas, Texas, where he completed his general surgery training at Baylor University Medical Center. 

Dr. Ponce de Leon is a pioneer in advanced laparoscopic general surgery, recently performing the first, single-incision adrenalectomy in Texas. He specializes in bariatric surgery, including lap band. Recently certified to perform a new robotic surgery called the da Vinci® procedure, Dr. Ponce de Leon continues to stay on the cutting-edge of medical advancements. Being a constant learner helps Dr. Ponce de Leon achieve his goal of providing the best possible care to each of his patients. 

Dr. Ponce de Leon is a fluent Spanish speaker and stays active in the Hispanic community. In his spare time, he enjoys fishing and spending time with his family.


  • General Surgery
  • Bariatric Surgery
  • Doctor of Medicine
  • Bachelor of Science, Biochemistry
Areas of Expertise
  • Breast Disease/Cancer
  • Appendicitis
  • Weight Loss Surgery
  • Gallbladder Disease
  • Colon Disease/Cancer
  • Hemorrhoids
  • Hernia Repair
  • Reflux Surgery
  • Thyroid/Parathyroid Disease/Cancer
  • Pancreatic Disease/Cancer
  • Skin Lesions/Masses/Cysts
  • Laparoscopic Surgery
  • Robotic Surgery
  • Spinal exposure for anterior lumbar interbody fusion (ALIF)
  • English
  • Spanish