6744 Clayton Rd Suite #305, Richmond Heights, MO 63117


During the COVID 19 pandemic, we are still seeing new and current patients in our clinics and we are now also providing remote consultations through video conferencing. Please call our offices to schedule a consultation.

St. Louis: 314-472-5016

Our St Louis Team

David Greengart,MD, FACEP

As a board-certified physician with over 13 years of emergency medicine experience, Dr. Greengart has seen first-hand how opiate addiction has destroyed the lives of so many. He has seen patients who WANT to get well, and get clean, but are unable to do so on their own. As opiate abuse and addiction has reached epidemic proportions in this country, Dr. Greengart has established the Midwest Health Center to provide a safe place where opiate addicts, and others struggling with opiate abuse and misuse, can get help. He is passionate about his desire to help his patients get well, and to enrich and enhance their lives while getting and staying sober.


UNDERGRADUATE: Touro College, New York City, NY
MEDICAL SCHOOL: Mount Sinai School of Medicine, New York City, NY
RESIDENCY: University of Arkansas for Medical Sciences, Little Rock, AR

Alexis Strange, APRN, MSN, FNP-C

Alexis is a family nurse practitioner, board certified through the American Academy of Nurse Practitioners. She has worked primarily in emergency medicine now for 9 years, majority of those working alongside Dr. Greengart. She has witnessed first hand the complicated issues surrounding opioid use disorder and has a strong desire to help those wanting to get clean, stay clean, and take back their lives.

Yocheved Witten, APRN, MSN, FNP-BC

Yocheved Witten, APRN, MSN, FNP-BC, is originally from Far Rockaway, NY. She received her nursing degree from NYU College of Nursing. After completing her nursing degree, Yocheved traveled abroad for one year with her husband. While out of the country, Yocheved spent countless hours volunteering at a community hospital, working in many different areas of medicine. After returning to the USA, Yocheved began a graduate program at Walden University where she graduated as a Family Nurse Practitioner. Yocheved’s interests are in family medicine and addiction care. Yocheved has also worked in adult and pediatric family medicine as well as women’s health. After her experience in these various fields of medicine Yocheved’s greatest passion has been being able to connect to her patients and help them improve their health and overall wellness. Here at the Midwest Health Center-St Louis, Yocheved utilizes this passion to help patients take their lives back and build forward to a brighter future!