Mary Markert is a Dermatologist in Durham, North Carolina. Dr. Markert is rated as an Elite provider by MediFind in the treatment of Immune Defect due to Absence of Thymus. Her top areas of expertise are Immune Defect due to Absence of Thymus, Congenital Athymia, DiGeorge Syndrome, and CHARGE Syndrome.

Rasheed Gbadegesin is a Pediatrics provider in Durham, North Carolina. Dr. Gbadegesin is rated as an Experienced provider by MediFind in the treatment of Immune Defect due to Absence of Thymus. His top areas of expertise are Hypertension, High Blood Pressure in Infants, Anemia, and Williams Syndrome. Dr. Gbadegesin is currently accepting new patients.

Jonathan Routh is a Pediatrics provider in Durham, North Carolina. Dr. Routh is rated as an Experienced provider by MediFind in the treatment of Immune Defect due to Absence of Thymus. His top areas of expertise are Neurogenic Bowel, Pelvic Floor Dysfunction, Rhabdomyosarcoma, Lithotripsy, and Ureteroscopy. Dr. Routh is currently accepting new patients.

Allan Kirk is a Transplant Surgeon and a Pediatrics provider in Durham, North Carolina. Dr. Kirk is rated as an Experienced provider by MediFind in the treatment of Immune Defect due to Absence of Thymus. His top areas of expertise are Malnutrition, Hepatic Ischemia, Infantile Neutropenia, Kidney Transplant, and Islet Cell Transplantation. Dr. Kirk is currently accepting new patients.

Vandana Shashi is a Medical Genetics specialist and a Pediatrics provider in Durham, North Carolina. Dr. Shashi is rated as a Distinguished provider by MediFind in the treatment of Immune Defect due to Absence of Thymus. Her top areas of expertise are DiGeorge Syndrome, Hypotonia, Immune Defect due to Absence of Thymus, and Micrognathia. Dr. Shashi is currently accepting new patients.

Elizabeth Goldmuntz is a Pediatric Cardiologist in Philadelphia,, Pennsylvania. Dr. Goldmuntz is rated as a Distinguished provider by MediFind in the treatment of Immune Defect due to Absence of Thymus. Her top areas of expertise are Tetralogy of Fallot, Congenital Heart Disease (CHD), DiGeorge Syndrome, and Immune Defect due to Absence of Thymus.

Elaine Zackai is a Medical Genetics specialist and a Pediatrics provider in Philadelphia, Pennsylvania. Dr. Zackai is rated as a Distinguished provider by MediFind in the treatment of Immune Defect due to Absence of Thymus. Her top areas of expertise are Micrognathia, DiGeorge Syndrome, Hardikar Syndrome, Myringotomy, and Gastrostomy.

Tingwei Guo is a Medical Genetics provider in Philadelphia, Pennsylvania. Dr. Guo is rated as a Distinguished provider by MediFind in the treatment of Immune Defect due to Absence of Thymus. His top areas of expertise are Immune Defect due to Absence of Thymus, DiGeorge Syndrome, Mosaic Monosomy 22, and Coffin-Siris Syndrome.

Kari Lima is a primary care provider, practicing in Pediatrics and Family Medicine in Olympia, Washington. Dr. Lima is rated as an Advanced provider by MediFind in the treatment of Immune Defect due to Absence of Thymus. Her top areas of expertise are Hypoparathyroidism, DiGeorge Syndrome, Pyle Disease, and Immune Defect due to Absence of Thymus.

Lindsay Freud is a Pediatrics provider in Boston, Massachusetts. Dr. Freud is rated as an Advanced provider by MediFind in the treatment of Immune Defect due to Absence of Thymus. Her top areas of expertise are Ebstein's Anomaly, Pulmonary Atresia, Hypoplastic Left Heart Syndrome (HLHS), Congenital Heart Disease (CHD), and Heart Transplant.

Jennifer Leiding, M.D., is associate director for clinical research in the Johns Hopkins All Children’s Institute for Clinical and Translational Research and assistant director of the Center for Cellular and Gene Therapy in the Johns Hopkins All Children’s Cancer & Blood Disorders Institute. She is also an associate professor of pediatrics (pending academic review) based on the St. Petersburg, Florida, campus in the Johns Hopkins University of School of Medicine. Dr. Leiding, whose clinical specialty is allergy and immunology, focuses on strategic growth of, and mentorship in, clinical research and early-phase trials campus-wide, as well as cellular and gene therapies for cancer and blood disorders. Her personal line of research and national leadership focuses on cooperative multicenter studies of primary immunodeficiency diseases, including chronic granulomatous disease (CGD) and other rare diseases in children. She returned to Johns Hopkins All Children’s in 2024 after previously serving on the faculty at the USF Morsani College of Medicine and the medical staff of All Children’s for nearly a decade. In between, she worked as a medical director at a gene therapy-focused biotech company. Dr. Leiding earned her medical degree from USF before training there as an intern and resident in pediatrics. She completed her clinical and research fellowship in both allergy and immunology at the National Institute of Allergy and Infectious Diseases. Dr. Leiding is rated as an Experienced provider by MediFind in the treatment of Immune Defect due to Absence of Thymus. Her top areas of expertise are Chronic Granulomatous Disease, Primary Immunodeficiency (PID), Severe Combined Immunodeficiency (SCID), and Clouston Syndrome.

Nicholas Hartog is a Pediatric Allergy and Immunologist and an Allergy and Immunologist in Grand Rapids, Michigan. Dr. Hartog has been practicing medicine for over 15 years and is rated as an Experienced provider by MediFind in the treatment of Immune Defect due to Absence of Thymus. His top areas of expertise are Primary Immunodeficiency (PID), Common Variable Immune Deficiency, Adenosine Deaminase Deficiency, and Severe Combined Immunodeficiency (SCID). Dr. Hartog is currently accepting new patients.

Jolan Walter is a Pediatric Allergy and Immunologist in St Petersburg, Florida. Dr. Walter is rated as an Experienced provider by MediFind in the treatment of Immune Defect due to Absence of Thymus. Her top areas of expertise are Severe Combined Immunodeficiency (SCID), Primary Immunodeficiency (PID), Infantile Neutropenia, and Common Variable Immune Deficiency.

Joseph Turek is a General Surgeon in Durham, North Carolina. Dr. Turek is rated as an Experienced provider by MediFind in the treatment of Immune Defect due to Absence of Thymus. His top areas of expertise are Partial Atrioventricular Canal, Coarctation of the Aorta, Hypoplastic Left Heart Syndrome (HLHS), Heart Transplant, and Heart Valve Repair.

Dr. Couser obtained his bachelor’s degree from the University of Virginia and his Medical Doctorate from the Virginia Commonwealth University School of Medicine (VCU SOM). Dr. Couser’s ophthalmology residency was completed at Howard University where he served as co-chief resident in the last year of his residency. He received fellowship training in pediatric ophthalmology and adult strabismus at Emory University. Dr. Couser received a master’s degree in biotechnology from the Johns Hopkins University and completed a residency in clinical genetics at the University of North Carolina at Chapel Hill. He is one of only a few individuals currently board-certified by both the American Board of Ophthalmology and the American Board of Medical Genetics and Genomics. CV https://www.hopkinsmedicine.org/-/media/wilmer/documents/cvs/couser-cv Research Summary My primary research focus involves the identification and management of genetic eye diseases including rare inherited disorders affecting the eyes. Research and scholarly activities have been an integral component of my career path. I have been the principal investigator on 10 clinical trial/IRB studies and a co-investigator on others, participated with several committees or advisory panels related to research activities. I have been credited with over 120 book chapter, journal article and abstract publications. In addition, I served as the primary author/sole editor for a textbook titled Ophthalmic Genetic Diseases: A Quick Reference Guide to the Eye and External Ocular Adnexa Abnormalities, 1st Edition, published by Elsevier in 2018, which is one of only a few textbooks published in this subject area. I also served as a grant review panelist for the National Eye Institute Career Development Awards. Selected Publications *Couser NL, Masood MM, Strande NT, Foreman AKM, Crooks K, Weck KE, Lu M, Wilhelmsen KC, Roche M, Evans JP, Berg JS, Powell CM. 2015. The phenotype of multiple congenital anomalies- hypotonia-seizures syndrome 1: Report and review. Am J Med Genet Part A 9999A:1–6 *Couser NL, Lambert SR. Botulinum toxin: A treatment of consecutive esotropia in children. Strabismus 2012; 20(4):158-161 Couser NL, Lenhart PD, Hutchinson AK. Augmented Hummelsheim procedure to treat complete abducens nerve palsy. J AAPOS 2012;16(4):331-5 *Natario L. Couser, Maheer M. Masood, Arthur S. Aylsworth, and Roger E. Stevenson. Ocular manifestations in the X-linked intellectual disability syndromes. Ophthalmic Genet. 2017, Jan 23:1-12 *Couser NL, Brooks BP, Drack AV, Shankar SP. The evolving role of genetics in ophthalmology. Ophthalmic Genet. 2021 Jan 12:1-4. doi: 10.1080/13816810.2020.1868011. Dr. Couser is rated as an Experienced provider by MediFind in the treatment of Immune Defect due to Absence of Thymus. His top areas of expertise are Epicanthal Folds, Strabismus, Brown Syndrome, and Hypotonia.

Dr. Habela completed a Medical Scientist Training Program at the University of Alabama, Birmingham. She received her PhD in Neurobiology in 2008 and her MD in 2010. After medical school, she specialized in child neurology, and completed 2 years of pediatrics residency and 3 years of child neurology residency at the Johns Hopkins Hospital in 2015. She then completed another 2 years of training specifically focused on the diagnosis, characterization and medical and surgical management of patients with epilepsy during an Epilepsy Fellowship at Johns Hopkins. Dr. Habela’s clinic specializes in pediatric neurology and epilepsy. Her clinical focus in on the care of patients with severe epilepsy with or without other neurodevelopmental disorders that have not been easily controlled with medications. She is also focused on the genetic causes of epilepsy and other neurodevelopmental disabilities with the hope that increasing our understanding of the genetic causes of epilepsy and neurodevelopmental disabilities will improve treatment. Dr. Habela’s basic science research is focused on the genetic mechanisms regulating appropriate proliferation, migration and integration of neurons and glial cells in both the prenatal and postnatal developing brain and how aberrations in these processes result in neurodevelopmental disabilities. Her hypothesis is that deregulation of pre and postnatal neurogenesis and synaptogenesis contributes to the behavioral phenotypes observed in many forms of intellectual disability, epilepsy and autism. Her research applies what we know from human genetic studies to basic science studies examining how specific genetic changes alter neurogenesis, synaptogenesis and overall excitation / inhibition balance in laboratory model systems. Her goal is to provide a better understanding of the molecular mechanisms of these processes and, in turn, possibly identify specific targets for disease modifying treatments for epilepsy. Contact for Research Inquiries 600 N. Wolfe Street Meyer 2-147 Baltimore, MD 21287 Phone: (410) 955-9100. Dr. Habela is rated as an Experienced provider by MediFind in the treatment of Immune Defect due to Absence of Thymus. Her top areas of expertise are 15q11.2 Microdeletion, Primary Lateral Sclerosis, Amyotrophic Lateral Sclerosis (ALS or Lou Gehrig's Disease), Epilepsy, and Endovascular Embolization.

Ambroise Wonkam is a Pediatrics specialist and a Medical Genetics provider in Baltimore, Maryland. Dr. Wonkam is rated as an Experienced provider by MediFind in the treatment of Immune Defect due to Absence of Thymus. His top areas of expertise are Anemia, Fragile X Syndrome, Pyle Disease, and Micrognathia.

Peter Woolman is a Pediatric Cardiologist in San Antonio, Texas. Dr. Woolman is rated as an Experienced provider by MediFind in the treatment of Immune Defect due to Absence of Thymus. His top areas of expertise are Cor Triatriatum, Immune Defect due to Absence of Thymus, DiGeorge Syndrome, and Ventricular Septal Defects.

Pe’er Dar, MD, is Director of Fetal Medicine and OBGYN Ultrasound at Montefiore and Professor of Obstetrics and Gynecology and Women’s Health at our Albert Einstein College of Medicine. Dr. Dar’s clinical focus is on the care of women who carry babies with disorders and medical conditions that may affect their lives and he leads the Fetal Medicine and Surgery Team at Montefiore. He particularly specializes in diagnosis and management of medical and structural abnormalities in the fetus and in complicated twin and triplet pregnancies. His expertise include performing detailed ultrasound examination of the fetus including fetal echocardiography (scanning of the fetal heart) and fetal neurosonography (scanning of the fetal brain) as well as performing in-utero fetal surgeries such as fetoscopic laser surgery for monochorionic twins with twin to twin transfusion syndrome, in-utero blood transfusion for fetuses with anemia and in-utero drainage and shunt procedures. Dr. Dar is also experienced in performing amniocentesis, chorionic villous sampling (CVS) and multifetal selective reduction for multiple pregnancies.    Dr. Dar completed his Doctor of Medicine from Tel-Aviv University in Tel-Aviv, Israel in 1986. He started his postgraduate education at Assaf Harofe Medical Center, Tel-Aviv University, with a residency in obstetrics and gynecology and a specialty in high-risk pregnancies from 1992 through 1998. He then came to Montefiore-Einstein, completing a two-year fellowship in medical and reproductive genetics. After spending two years as an attending-specialist in the field of prenatal diagnosis he completed in 2005 three-year residency in obstetrics and gynecology at Montefiore-Einstein. In 2007, he completed additional training in fetal surgery in world-known fetal surgery centers in France and Belgium.  Dr. Dar is very active in research and he is currently the principal investigator in many studies including international multicenter studies. His research focus is in fetal medicine and surgery, non-invasive prenatal screening and placenta accreta spectrum. He has shared his work in many peer-reviewed journals, textbook chapters, abstracts and invited presentations. He is also a reviewer for national and international journals including the American Journal of Obstetrics and Gynecology, Plos one and Prenatal Diagnosis. Dr. Dar is board certified in both Obstetrics and Gynecology and Clinical Genetics and is a member of several professional societies including the Society of Maternal and Fetal Medicine, International Fetal Medicine and Surgery Society and the International Society of Ultrasound in Obstetrics and Gynecology. He has been regularly listed among Castle Connolly Top Doctors for obstetrics and gynecology in the New York Metro area. Dr. Dar is rated as an Experienced provider by MediFind in the treatment of Immune Defect due to Absence of Thymus. His top areas of expertise are Placenta Previa, Trisomy 18, Trisomy 13, and Chromosome 13q Duplication.

Christoph Hornik is a Pediatric Cardiologist in Durham,, North Carolina. Dr. Hornik is rated as an Experienced provider by MediFind in the treatment of Immune Defect due to Absence of Thymus. His top areas of expertise are Premature Infant, High Blood Pressure in Infants, Bronchopulmonary Dysplasia, and Neonatal Sepsis.