School of Medicine


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  • Lea Steffes

    Lea Steffes

    Instructor, Pediatrics - Pulmonary Medicine

    BioDr. Steffes, a Wisconsin native, completed medical school and pediatric residency at the Medical College of Wisconsin. She then moved to the Bay Area and completed her clinical fellowship in pediatric pulmonary medicine at Stanford University in 2020. Additionally, Dr. Steffes received further post-doctoral training in the laboratories of Dr. Maya Kumar and Dr. David Cornfield, studying the cellular and molecular mechanism driving pulmonary vascular disease. In addition to her role as an Instructor in Pediatrics in the division of Pulmonary Medicine, Dr. Steffes is also completing an advanced clinical fellowship in Pulmonary Hypertension at Lucile Packard Children’s Hospital Stanford. Her clinical work consists of caring for patients with pediatric pulmonary and pulmonary vascular diseases such as pulmonary hypertension, bronchopulmonary dysplasia, interstitial lung disease, respiratory failure, chronic cough and asthma. Her research is focused on the vascular changes seen in pulmonary hypertension, more specifically understanding the cellular characteristics of occlusive neointimal lesions, the abnormal cells that block pulmonary blood flow in pulmonary hypertension. In her most recent work, Dr. Steffes identified a subset of healthy vascular smooth muscle cells that are the cell of origin for the pathologic neointimal cells and a specific signaling pathway, that when blocked, inhibits the formation of neointimal lesions.

    Dr. Steffes is currently employing advanced single cell sequencing technologies to further understand neointimal cells with the ultimate goal identifying new therapies for pulmonary hypertension, a fatal disease with no known cure.

  • Lawrence Steinman, MD

    Lawrence Steinman, MD

    George A. Zimmermann Professor and Professor of Pediatrics

    Current Research and Scholarly InterestsOur laboratory is dedicated to understanding the pathogenesis of autoimmune diseases, particularly multiple sclerosis. We have developed several new therapies for autoimmunity, including some in Phase 2 clinical trials, as well as one approved drug, natalizumab. We have developed microarray technology for detecting autoantibodies to myelin proteins and lipids. We employ a diverse range of molecular and celluar approaches to trying to understand multiple sclerosis.

  • Lars Steinmetz

    Lars Steinmetz

    Professor of Genetics

    Current Research and Scholarly InterestsWe apply diverse genomic approaches to understand how genetic variation affects health and disease by: 1) functional and mechanistic analyses of gene regulation, 2) studies of meiotic recombination and inheritance, 3) analyses of genetic and environmental interactions, and 4) characterization of diseases in human cells and model organisms. We integrate wet lab and computational genomic, transcriptomic, proteomic and metabolic approaches, and develop technologies to enable personalized medicine.

  • David A. Stevens

    David A. Stevens

    Professor of Medicine, Emeritus

    Current Research and Scholarly InterestsImmunology and chemotherapy of human fungal diseases, particularly coccidioidomycosis (Valley Fever) in California and aspergillosis, and the parasitic disease, trypanosomiasis.

  • David Stevenson

    David Stevenson

    Professor of Pediatrics (Genetics)

    Current Research and Scholarly InterestsMy research focuses on disorders of the RAS/MAPK pathway (eg. NF1, Noonan, CFC, and Costello syndrome). I am working on understanding the impact of RAS signaling on the musculoskeletal system. I use genomic approaches to identify somatic events and modifiers in the RASopathies. I am also involved in identifying outcome measures for use in clinical trials for the associated orthopedic manifestations. Other areas of research involve vascular anomalies, Prader-Willi syndrome, and hypophosphatasia.

  • David K. Stevenson, M.D.

    David K. Stevenson, M.D.

    Harold K. Faber Professor of Pediatrics, Senior Associate Dean, Maternal and Child Health and Professor, by courtesy, of Obstetrics and Gynecology

    Current Research and Scholarly InterestsOur research is focused on the study of the ontogeny and control of heme catabolism and bilirubin production in the developing neonate. A better understanding of the role of increased bilirubin production in neonatal jaundice and the prevention of hemolytic jaundice has remained an overall objective of our program. We are also study the causes of preterm birth and ways to prevent it.

  • Tanya Stoyanova

    Tanya Stoyanova

    Assistant Professor of Radiology (Cancer Early Detection-Canary Center)

    Current Research and Scholarly InterestsStoyanova lab develops new early cancer detection methods and therapeutic strategies for late stage cancers. The current research focus is on protein-based biomarkers for early cancer detection as well as development of new small molecule inhibitors and antibody-based therapies for prostate and other epithelial cancers. The ultimate goals of the laboratory are to improve the early diagnosis and prognosis of clinically significant cancers and guide the development of novel and effective therapeutic strategies for metastatic prostate and other epithelial cancers.

  • Aaron F. Straight

    Aaron F. Straight

    Professor of Biochemistry and, by courtesy, of Chemical and Systems Biology

    Current Research and Scholarly InterestsWe study the biology of chromosomes. Our research is focused on understanding how chromosomal domains are specialized for unique functions in chromosome segregation, cell division and cell differentiation. We are particularly interested in the genetic and epigenetic processes that govern vertebrate centromere function, in the organization of the genome in the eukaryotic nucleus and in the roles of RNAs in the regulation of chromosome structure.

  • Sarah Streett

    Sarah Streett

    Clinical Professor, Medicine - Gastroenterology & Hepatology

    BioDr. Sarah Streett is a Clinical Professor of Medicine, the Director of Inflammatory Bowel Disease Education at Stanford, and she is passionate about taking care of people with IBD. She is a national expert in treating complex IBD and initiated a multi-disciplinary approach to care with colorectal surgery, pediatrics, and nutrition. In 2018 she received the Champion of Hope Award from the Crohn’s and Colitis Foundation and serves on their National Scientific Advisory Committee. Her interests focus on fertility and pregnancy in people with IBD, developing precision approaches to IBD therapy, and the role that the microbiome and diet play in its pathogenesis. She is a primary investigator of the Stanford IBD Registry and has research projects focused on optimizing clinical outcomes in IBD, the role of the microbiota and diet in IBD and pregnancy, and applying new technologies to individualizing therapy for IBD. She is also the primary investigator on multiple industry-sponsored IBD trials.

    Teaching is a top priority for Dr. Streett who feels that mentoring fellows in the development of their careers is a privilege. She has held many national leadership roles in the American Gastroenterological Association, where she has been Chair of the Practice Management and Economics Committee, and currently serves on the Government Affairs Committee. She also an appointed member of the Gastrointestinal Drug Advisory Committee at the FDA. She has represented the interests of gastroenterologists and their patients on Capitol Hill numerous times. Dr. Streett believes strongly in a collaborative approach to give patients personalized care based on the latest therapies for the treatment of IBD and is committed to mentoring the next generation of experts in the field.

  • Matthew Strehlow

    Matthew Strehlow

    Associate Professor of Emergency Medicine

    Current Research and Scholarly InterestsDr. Strehlow's research is focused on global health and global emergency care. Working with in-country partners, he aims to identify the epidemiology of emergencies in developing countries and leverage the growth of emergency care systems in innovative ways to improve the overall health of the population. Specific examples include improving patient flow between the community and different level facilities and using emergency call center infrastructure to combat gender based violence.