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.

  • Michael Tracy

    Michael Tracy

    Clinical Associate Professor, Pediatrics - Pulmonary Medicine

    BioDr. Tracy is a Clinical Associate Professor in the Division of Pediatric Pulmonary. His clinical interests include care for children with bronchopulmonary dysplasia (BPD), chronic respiratory failure, mechanical ventilation, childhood interstitial lung disease, and cystic fibrosis. He serves as the director Pediatric Pulmonary BPD Program, and co-director of the Cardiac and Respiratory care for Infants with BPD (CRIB) Program. He is the medical director of the Stanford Technology Assisted Respiratory (STAR) Program and the physician lead for the inpatient Pulmonary consult service at LPCH. Dr. Tracy is currently involved in clinical research to improve care for infants with BPD. With regard to medical education, he was formerly a chief resident in pediatrics at LPCH, and served as a faculty coach in the pediatric residency program.