Martha St. John, MD
Dr. St. John opened her private practice after graduating from residency in 2006. Over the years, her primary goal has been to provide care to psychiatric patients from Houston and beyond which is both accessible and highly effective. To meet these goals, she has remained steadfast in her commitment to participate in a variety of insurance plans. She also hired a physician assistant in 2016 in order to help address the growing need for competent care in the community.
Dr. St John was an early adopter of transcranial magnetic stimulation (TMS thearpy). In 2013, she began performing the treatment in order to meet the needs of depressed patients who had failed to become well with traditional antidepressant medication. Following this trend, she also began offering IV ketamine infusion therapy in her office in 2017.
Beyond her interest in treating treatment-resistant depression, Dr. St John treats adults, ages 18 and up, for a broad range of disorders, including ADHD, bipolar disorder, generalized anxiety disorder, panic disorder, social anxiety disorder, and OCD.
Dr. St John is Board Certified psychiatrist and an elected Fellow of the American Psychiatric Association. She is a member of the Clinical TMS Society and the American Society of Ketamine Physicians.
Dr. St John is a native Houstonian. She attended Rice University where she earned a Bachelor of Arts degree in Biochemistry. She completed her doctorate in medicine and residency training at the University of Texas Health Science Center at Houston. She lives in West Houston with her husband and three children.
Elizabeth Grizzaffi, PA-C
Mrs. Grizzaffi joined Martha St. John & Associates in September 2016. Her interests include ADHD, anxiety disorders and eating disorders. She is nationally board-certified with the National Commission on Certification of Physician Assistants.
She has previous experience in primary care, endocrinology, allergy, and asthma. Elizabeth (Liz) Ann Grizzaffi is a native Houstonian and grew up in the Cy-Fair area. She received a Bachelor of Arts degree from Saint Mary of the Woods in 2000. Mrs. Grizzaffi went on to earn a Bachelor of Science in Respiratory Therapy in 2007 and then earned her Master of Physician Assistant Studies at the University of Texas Medical Branch in Galveston, Texas in 2010.
Rachel DeLaCerda has been assisting Dr. St John in treating TMS patients since she joined the practice as our TMS Coordinator in the fall of 2016. Rachel is a certified TMS Technician and patient advocate.
Rachel assists patient and their family members through the entire TMS process, from scheduling an initial consultation and answering questions about the procedure, to communicating with referring physicians and corresponding with insurance companies.
Patient’s repeatedly comment on how Rachel’s gentle manner and friendly attitude immediately put them at ease and make the six weeks of treatment especially pleasant.
Susan Brown joined Martha St. John & Associates in September 2016. Susan has worked the administrative/management side in the medical field for over 30 years. She is HIPPA certified and experienced with insurance and scheduling appointment. She is happy to assist you with any questions you may have.
Daphne McConnell, RN
Daphne started her nursing career in a hospital environment and more specifically on a telemetry unit. She quickly realized she desired a more individualistic approach to her patients and pursued a position in hemodialysis nursing. After a relocation to Houston, Daphne started with our team in the Spring of 2019 as our ketamine infusion nurse, bringing her passion and professionalism to our patient care process. She truly cares about her patients and advocates with their best in mind. Daphne quickly builds positive relationships with her patients and ensures their infusion experience is a safe and positive one.