Stanford University
Showing 2,761-2,780 of 7,793 Results
-
Siegfried Hecker
Professor (Research) of Management Science and Engineering and Senior Fellow at the Freeman Spogli Institute for International Studies, Emeritus
Current Research and Scholarly Interestsplutonium science; nuclear weapons stockpile stewardship; cooperative threat reduction
-
Britt Hedman
Professor of Photon Science
BioBritt Hedman’s research program is focused on the development and applications of x-ray absorption and emission spectroscopies using synchrotron radiation, with a scientific emphasis primarily on study of the electronic and structural aspects of metal ion active sites in bioinorganic and biological systems. A common theme is to investigate how structure at molecular and macromolecular levels relates to function.
A major long-term focus has been the active site of the enzyme nitrogenase, and the various nitrogenase metal clusters, including elucidating the electronic and geometric structure of those that are formed and changed along their biosynthetic pathways. Other systems of systematic studies include iron-sulfur cluster containing enzymes, blue and multi-copper proteins, heme-copper oxidases, and iron-containing oxidases. Methods developments include x-ray absorption spectroscopy (edge and extended fine structure - or EXAFS), including the application of multiple-scattering analysis in EXAFS studies of metal clusters relevant to bioinorganic systems, the development of methodology for polarized single crystal x-ray absorption spectroscopy, and methodology and instrumentation development for soft- through hard-energy XAS.
Britt Hedman received her B.S and B.A. in Chemistry, M.Sc. in Inorganic Chemistry, and Ph.D. in Chemistry from the University of Umeå, Sweden. She was Assistant Professor (equivalent) in Inorganic Chemistry at the University of Umeå before coming to Stanford, initially as Senior Academic Scientific Staff, followed by appointed as Professor (Research) in 2002, and Professor of Photon Science in 2007. -
Gregory M. Heestand, MD
Clinical Associate Professor, Medicine - Oncology
BioDr. Heestand is a board-certified medical oncologist with a focus on gastrointestinal cancers, primarily hepatocellular carcinoma, cholangiocarcinoma, and gallbladder cancer. He serves as the medical oncology champion of the Stanford Hepatobiliary Tumor Board, as well as the principal investigator of multiple clinical trials. He collaborates with campus laboratories to help develop new biomarker and treatment technologies. He is the former director of the Stanford Oncology Fellowship Program.
Dr. Heestand and his team take great pride in helping patients and their families face gastrointestinal cancer.
Outside of the clinic, Dr. Heestand enjoys playing the piano, teaching his kids about music, cooking for friends and family, and surfing the internet for interesting things to read. -
Sam Heft-Neal
Senior Research Scholar
BioSam Heft-Neal is a Senior Research Scholar at the Center on Food Security and the Environment. Sam is working to identify the impacts of environmental changes on health, agriculture, and food availability around the world. His recent work combines household surveys with remote sensing data to examine environmental drivers of child health. Sam holds a Ph.D. in Agricultural and Resource Economics from the University of California, Berkeley and a B.A. in Statistics and Economics from the same institution.
-
John P. Hegarty II
Clinical Assistant Professor, Psychiatry and Behavioral Sciences
BioI am a neuroscientist and Principal Investigator of the Stanford Clinical Neuroscience (CNS) Lab in the Department of Psychiatry and Behavioral Sciences as well as Director of Neuroimaging for the Autism and Developmental Disorders Research Program at Stanford. My innovative research studies clinical aspects of cognitive and behavioral neuroscience, with a special focus on examining the neural circuitry associated with important brain-behavior relationships that may underlie different psychological and psychiatric domains in autistic children, adolescents, and adults. The ultimate goal of this research is to improve our understanding of the development of different cognitive and behavioral skills in order to develop mechanistically driven interventions that will improve precision medicine for mental health. Biologically based diagnosis and treatment are extremely limited for most psychological and psychiatric conditions but also critically needed to increase early identification and improve treatment outcomes, especially for neurodevelopmental disorders in which early intervention is the most beneficial. My early career research has primarily focused on clinical neuroscience using neuroimaging (e.g., MRI & EEG) to examine the effects of different drugs and behavioral interventions on the brain, especially for developing biomarkers for improving treatment planning and monitoring biological changes in response to single dose and clinical trials.
My primary contributions to science thus far fall within these major categories: 1) identifying the neural correlates of individual differences in cognition and behavior, 2) developing new interventions and investigating the neurobiological substrates of response to treatment, 3) examining different factors that contribute to brain development, 4) summarizing and increasing accessibility to autism-related research, and 5) methods development for neuroimaging studies. My earliest research investigated the neurobiology of alexithymia, dyslexia, and stress using structural and functional magnetic resonance imaging to test theories of the mechanisms that contribute to differences in cognition and behavior. My subsequent dissertation research, in which I began to focus on neurodevelopmental disorders, examined the neural correlates of response to beta-blockers in autistic adults and also assessed the contribution of cerebellar circuits to the autism phenotype. During my postdoctoral training, I have developed further skills for working with children in multiple clinical research settings, especially for using advanced neuroimaging approaches to examine important brain-behavior relationships. This includes a recent K99/R00 from the National Institute of Child Health and Human Development (NCT04278898 & NCT05664789) that will assess the neurobiology of restricted and repetitive behaviors in autistic children and examine the efficacy and target engagement of a novel nutritional supplement and investigational drug, N-acetylcysteine (NAC), in the brain. You can find more information about our NAC studies at https://redcap.link/NACandAutism. -
Shireen N. Heidari
Clinical Associate Professor, Medicine - Primary Care and Population Health
BioShireen Heidari, MD is a palliative care and family medicine physician. She works as part of the inpatient palliative care consult team providing symptom management and support for patients and families facing any stage of a serious illness. Dr. Heidari is the program director for the Stanford University Hospice and Palliative Fellowship. She previously served as the clinical lead for the Stanford site of the PERIOP-PC Study, collaborating with the surgical department to evaluate the impact of early palliative care support for patients and family members preparing for major upper gastrointestinal cancer surgery.
Dr. Heidari is also a writer whose pieces about the importance of human connection, tough conversations, and stigma around healthcare workers seeking help for their mental health have been published in The New England Journal of Medicine, The Lancet Respiratory Medicine, CHEST, The Journal of Pain and Symptom Management, and the Intima. She hopes that by sharing her own story, she can continue being part of these conversations as we advocate for culture change in medicine and more sustainable practice.
Before moving to northern California, Dr. Heidari attended medical school at Boston University, completed her residency at UC San Diego where she served as chief resident, followed by palliative fellowship at UCLA. Outside of her clinical and mentorship work, she is likely writing creatively or outside with her husband chasing their dogs. She is currently writing her first fiction novel. -
Paul Heidenreich, MD
Professor of Medicine (Cardiovascular)
Current Research and Scholarly InterestsMy research interests include
1) The cost-effectiveness of new cardiovascular technologies.
Example: tests to screen asymptomatic patients for left ventricular systolic dysfunction.
2) Interventions to improve the quality of care of patients with heart disease. Examples: include clinical reminders and home monitoring.
3) Outcomes research using existing clinical and administrative datasets.
4) Use of echocardiography to predict prognosis (e.g. diastolic dysfunction). -
Boris Heifets
Associate Professor of Anesthesiology, Perioperative and Pain Medicine (MSD) and, by courtesy, of Psychiatry and Behavioral Sciences (General Psychiatry and Psychology (Adult))
Current Research and Scholarly InterestsHarnessing synaptic plasticity to treat neuropsychiatric disease
-
Sebastian Heilpern
Assistant Professor of Earth System Science
BioSebastian is an ecologist and sustainability scientist studying the causes of biodiversity change and its consequences for ecosystems and human well-being, with a particular emphasis on aquatic ecosystems. In linking causes to consequences, his research also seeks to identify opportunities to align biodiversity conservation with societal objectives around public health, food systems, and renewable energy. His research integrates field work, data science and synthesis, and spans scales from local and regional studies in tropical river basins such as the Amazon to global analyses. Prior to joining Stanford, he was an Eric & Wendy Schmidt AI in Science Postdoctoral Fellow at Cornell University.
-
Sarah Heilshorn
Rickey/Nielsen Professor in the School of Engineering and Professor, by courtesy, of Bioengineering and of Chemical Engineering
Current Research and Scholarly InterestsProtein engineering
Tissue engineering
Regenerative medicine
Biomaterials -
Wm. LeRoy Heinrichs
Member, Maternal & Child Health Research Institute (MCHRI)
Current Research and Scholarly InterestsSurgical simulation; team-training in virtual environments; online training of healthcare providers in virtual environments; tele-medicine for acute & chronic disease management in virtual environments
-
Tony Heinz
Director, Edward L. Ginzton Laboratory, Professor of Applied Physics, of Photon Science, and, by courtesy, of Electrical Engineering
Current Research and Scholarly InterestsElectronic properties and dynamics of nanoscale materials, ultrafast lasers and spectroscopy.
-
Jeremy J. Heit, MD, PhD
Professor of Radiology (Neuroimaging and Neurointervention)
Current Research and Scholarly InterestsOur research seeks to advance our understanding of cerebrovascular disease and to develop new minimally invasive treatments for these diseases. We study ischemic and hemorrhagic stroke, cerebral aneurysms, delayed cerebral ischemia, cerebral arteriovenous malformations (AVMs), dural arteriovenous fistulae, and other vascular diseases of the brain. We use state-of-the-art neuroimaging techniques to non-invasively study these diseases, and we are developing future endovascular technologies to advance neurointerventional surgery.
www.heitlab.com -
Katherine Hekman
Assistant Professor of Surgery (Vascular Surgery)
BioDr. Hekman earned her Bachelor’s degree at Johns Hopkins University, followed by her MD and PhD at the University of Chicago. She then completed vascular surgery residency at Northwestern University. Dr. Hekman’s primary research focus is on stem cell-based regenerative medicine for treating vascular disease. Her clinical research interests also include reducing surgical site infections, optimizing the care of venous thromboembolism, and promoting wellness in surgical training.
-
Samuel Helfont
Visiting Fellow, HOOVER RESEARCH
BioSamuel Helfont is a Visiting Fellow at the Hoover Institution and an Associate Professor of Strategy and Policy in the Naval War College program at the Naval Postgraduate School in Monterey, California. His research focuses on international history and politics in the Middle East, especially Iraq and the Iraq Wars. He is also interested in Israeli, maritime, and post-Cold War global history. He is the author of The Iraq Wars: A Very Short Introduction (Oxford University Press, October 2025), Iraq against the World: Saddam, America, and the Post-Cold War Order (Oxford University Press, 2023), and Compulsion in Religion: Saddam Hussein, Islam, and the Roots of Insurgencies in Iraq (Oxford University Press, 2018). He co-edited (with Lisa Blaydes) Ba‘thist Iraq through Archives: Reflections, Explorations, and Opportunities (Stanford University Press, forthcoming 2026). Both Compulsion in Religion and Iraq against the World were translated into Arabic and released by leading Iraqi publishing houses. His work has also been published or is forthcoming in Diplomatic History, the American Historical Review, The International History Review, Security Studies, The Middle East Journal, Texas National Security Review, Orbis, Foreign Affairs, The Washington Post, The New Republic, The American Interest, and War on the Rocks, among other outlets.
Helfont holds a PhD in Near Eastern Studies from Princeton University. Prior to moving to Monterey, he completed a three-year post-doctoral lectureship at the University of Pennsylvania. He has held affiliations with the Abbasi Program in Islamic Studies at Stanford University and the Foreign Policy Research Institute in Philadelphia. He also served as a Visiting Assistant Professor at Haverford College and was the recipient of the US Scholar Research Support Fellowship from the Hoover Library and Archives. In 2023, he received the Naval War College’s research award, presented annually to the faculty member whose scholarship demonstrated the highest level of excellence over the past three years.
In addition to this academic background, Helfont served as an intelligence officer in the US Navy and Navy Reserve. An Iraq War veteran, he completed deployments both afloat and ashore in the Middle East. He also served on Middle Eastern and counterterrorism missions at the Defense Intelligence Agency, the National Security Agency, and the Office of Naval Intelligence, among other commands.
