School of Medicine
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Qian Ma, MD, PhD
Clinical Assistant Professor, Adult Neurology
Current Research and Scholarly Interestsneurological complications from cancer treatment
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Qianheng Ma
Postdoctoral Scholar, Psychiatry
BioQianheng (Jessica) Ma obtained her PhD degree of biostatistics at University of Chicago under the supervision of Prof. Donald Hedeker and is the 2021 recipient of the dissertation grant from Society of Multivariate Experimental Psychology (SMEP). Her current research focus are modern statistical methods and deep learning techniques for mining (multivariate) intensive longitudinal data especially psychological/behavioral measures collected by mobile/wearable devices. Besides research, she loves playing the piano and is good at Jazz improvisation and she can speak fluent Cantonese.
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Quan Maq Ma
Postdoctoral Scholar, Genetics
BioQuan (Maq) Ma is a postdoctoral researcher in the Department of Genetics at the Stanford School of Medicine. His research focuses on developing high-throughput sequencing technologies to study RNA modifications and identify substrates of RNA-binding proteins using biochemical and chemical biology approaches. Maq is also interested in the role of RNA editing in inflammatory chronic diseases.
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Stephen Ma
Clinical Assistant Professor, Medicine
BioStephen Ma is a Clinical Assistant Professor in the Division of Hospital Medicine at Stanford University School of Medicine. His undergraduate degree was in Electrical Engineering at Princeton University, after which he pursued his MD/PhD at Columbia University. He then moved to Stanford University for his residency in Internal Medicine and fellowship in Clinical Informatics prior to joining the faculty. His clinical expertise is in the care of adult patients admitted to the inpatient general medicine services.
He is fellowship-trained in clinical informatics with the following areas of focus: 1) the implementation and evaluation of emerging technologies such as ambient AI scribes, 2) clinician-centered analytics and reporting, 3) the development of machine learning algorithms and workflows for standardization of care, and 4) care team communication and on-call scheduling. His overall approach to technology integration into healthcare emphasizes user-centered design, data-driven decision making, and rigorous demonstration of outcomes.
He previously performed his doctoral work in the laboratory of Professor Gordana Vunjak-Novakovic where he developed human cardiac models of disease incorporating patient-derived stem cells, optogenetics, tissue engineering, optoelectronics, and video processing. -
David Maahs
Lucile Salter Packard Professor of Pediatrics and Professor, by courtesy, of Epidemiology and Population Health
BioDr David M. Maahs is the Lucile Salter Packard Professor of Pediatrics, Division Chief of Pediatric Endocrinology, and Associate Chair for Academic Affairs in Pediatrics at Stanford University and the Lucile Packard Children’s Hospital. He earned his MD followed by Pediatric Residency at the University of New Mexico. After 3 years on New Mexico’s faculty, Dr. Maahs completed a Pediatric Endocrinology fellowship and a concurrent PhD in Epidemiology at the University of Colorado. He remained on Colorado’s faculty for 10 years, advancing to Professor of Pediatrics before moving to Stanford. Prior to his medical career, Dr. Maahs received a BA and MA in English from the University of Kansas and was inspired to pursue a medical career after serving in the Peace Corps with assignments in Tunisia and the Central African Republic.
Dr. Maahs’ leadership experiences include being a past co-Chair (2013-16) for Protocols and Publications with the Type 1 Diabetes Exchange for which he continues as Director of International Collaborations. This complements his role as President-elect for the International Society of Pediatric and Adolescent Diabetes (ISPAD, 2021-25) and Editor-in-Chief for the 2018 ISPAD Clinical Practice Consensus Guidelines. He served on the Professional Practice Committee for the American Diabetes Association (ADA, 2016-18), which writes the annual ADA Standards of Care. Previously, he served on the ADA Scientific Sessions committee representing the Council on Youth. He has also served on national committees for the American Heart Association, the Pediatric Endocrine Society, and multiple journal editorial boards and review committees.
His scholarly interest is improving care and preventing complications in people with type 1 diabetes (T1D). Along with Dr Peter Chase, he is author of the 12th and 13th editions of Understanding Diabetes, or ‘Pink Panther,’ which are the most widely used educational books for children newly diagnosed with T1D, distributed internationally by the Juvenile Diabetes Research Fund (JDRF). More specifically, he has conducted epidemiologic studies that help generate hypotheses for clinical studies, including trials to develop artificial pancreas systems to improve glucose control, lower disease burden, prevent the complications of diabetes, and reduce disparities in diabetes care. He is author or co-author of over 350 research publications. His multi-disciplinary research has been funded by the JDRF, the National Institutes of Diabetes and Digestive and Kidney Diseases (NIDDK), the Helmsley Charitable Trust, and the National Science Foundation (NSF).
Dr Maahs is Associate Director for the recently formed and NIDDK P30 funded Stanford University Diabetes Research Center (https://sdrc.stanford.edu). His collaborations extend to his role as Principal Investigator (PI) or steering committee member for NIH funded multi-center clinical trials including the FLEX, PERL, and ACTION studies as well as multiple Artificial Pancreas clinical trials. Education, mentorship, and training leadership includes being Program Director with Dr. Georgeanna Klingensmith on the Barbara Davis Center T32 and K12 training grants in Pediatric Endocrinology while at the University of Colorado. He is the PI on the Stanford NIH funded K12 "Training Research Leaders in Type 1 Diabetes.' Dr Maahs is also the Associate Chair for Academic Affairs for the Department of Pediatrics.
While in the Peace Corps, David met his wife, Christine Walravens, who is also a Pediatrician at Stanford. They enjoy outdoor activities and traveling with their adult children. -
Alex Macario MD MBA
Professor of Anesthesiology, Perioperative and Pain Medicine (MSD)
On Leave from 01/05/2026 To 07/03/2026Current Research and Scholarly InterestsDr. Macario studies health care economics & outcomes, with a special focus on surgery and anesthesia. He is well known for helping develop the field of operating room management, and is keenly interested in the cost-effectiveness analyses of drugs and devices. For the past decade Dr. Macario has added medical education as a research priority to better understand methods to best teach students and residents.
