San Antonio IVF Staff


Dr. Matthew "Tex" VerMilyea

Matthew “Tex” VerMilyea, PhD, HCLD

Matthew “Tex” VerMilyea, PhD, HCLD, graduated with honors from Cornell University before earning his PhD in genetics from The Medical School at the University of Birmingham, Institute of Biomedical Research. His background includes working as a research fellow at the Japan Society for the Promotion of Science (JSPS) and Biotechnology and Biological Sciences Research Council at the University of Birmingham. He also accepted academic posts at the University of Pennsylvania, Victoria University of Wellington and Auckland University. As a board-certified clinical consultant, medical laboratory scientific director of embryology and high complexity clinical laboratory director (HCLD), he served as the scientific director for Fertility Associates in New Zealand. Today he is the scientific director of Texas Fertility Center. He and his wife have a daughter and a son.


Roberta Hanson

Roberta earned her bachelor of science in medical technology in 1996 and has worked in medical laboratories for over two decades. She began work as an embryologist in 2005 at The Center for Reproductive Medicine in Wichita, Kansas, and moved to Texas to begin working for San Antonio IVF in 2012. She enjoys learning about new innovations and their applications in the assisted reproduction technology field. In her personal life, she enjoys watching professional football, antiquing, travelling, sitting on her deck watching the sunset, and also hanging with her husband, teenage boys, and dogs.


Gayle Williamson

Gayle is a proud Aggie who studied at Texas A&M University, graduating with her bachelor of science in genetics and animal science in 2006 and her master of science in genetics in 2011, while working in the Reproductive Sciences Lab. Before joining San Antonio IVF as an embryologist, she worked as an Associate Scientist at MD Anderson, generating mouse models for cancer research . When Gayle is not working, she enjoys riding horses, reading books and spending time with her husband and kids. She wears Aggie maroon whenever possible!


Andy Miller

Andy studied at Purdue University, earning his bachelor of science in animal sciences in 2013 and his master of science in reproductive physiology in 2015. Over the course of his studies, he performed research in embryology to determine the intracellular factors that impact oocyte maturation, fertilization and embryo development. Andy began working as an embryologist at San Antonio IVF after graduating. In his free time, he enjoys working out, traveling and hiking with his dog, Sasha.

About San Antonio IVF

San Antonio IVF Services

  • Semen analysis
  • Sperm function testing, including testing for antisperm antibodies
  • Sperm preparation for intrauterine insemination (IUI)
  • Microsurgical sperm retrieval procedures
    • Microsurgical epididymal sperm aspiration (MESA)
    • Percutaneous epididymal sperm aspiration (PESA)
    • Testicular sperm extraction (TESE)
  • Laser-assisted embryo hatching
  • Time-lapse photographic assessment of embryonic development
  • Embryonic genetic testing, including:
    • Preimplantation genetic diagnosis (PGD)
    • Preimplantation genetic screening (PGS)
  • Intracytoplasmic sperm injection (ICSI)
  • Gamete preservation
    • Sperm
    • Eggs
    • Embryos