Stanford University
Showing 701-800 of 1,703 Results
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Kabir Peay
Senior Associate Dean for Education, Director of the Earth Systems Program, Professor of Biology, of Earth System Science and Senior Fellow at the Woods Institute for the Environment
Current Research and Scholarly InterestsOur lab studies the ecological processes that structure natural communities and the links between community structure and the cycling of nutrients and energy through ecosystems. We focus primarily on fungi, as these organisms are incredibly diverse and are the primary agents of carbon and nutrient cycling in terrestrial ecosystems. By working across multiple scales we hope to build a 'roots-to-biomes' understanding of plant-microbe symbiosis.
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John R Peck
Spring CSP Instructor
BioJohn Peck teaches portrait and figure drawing for Stanford Continuing Studies.
His paintings and drawings can be seen in private collections and galleries in London, Florence, Dublin, and Santa Fe. He graduated from the Florence Academy of Art and received an MArch from the University of New Mexico, where he was an instructor in the School of Architecture and Planning. He is the co-author of “Drawing in Space: A Manual for Figurative Sculpture.”
His work can be viewed at www.johnpeck.com -
Sadia Peck
Affiliate, Central Mgmt-Misc AR
BioSadia Peck is a Certified Registered Nurse Anesthestist at Stanford Health Care. She graduated with her Master of Science in Nursing (MSN) from California State University, Fullerton/ Kaiser Permanente School of Anesthesia. Prior to obtaining her MSN, she obtained both her Masters in Health Administration and Bachelor of Science in Nursing from Florida Atlantic University. She also has a Bachelor of Science in Microbiology from the University of Florida. Her area of specialization is Anesthesia, providing high-quality and compassionate anesthesia care to adult peri-operative patients.
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Robert Pecora
Professor of Chemistry, Emeritus
Current Research and Scholarly InterestsThe development of the basic principles behind the dynamic light scattering (DLS) technique and its application to a wide variety of liquid systems is one of Pecora's outstanding contributions to physical chemistry. DLS is now an indispensable tool in the repertoire of polymer, colloid and biophysical chemists. It is generally accepted to be one of the best methods for measuring the mutual diffusion coefficients and, in dilute systems, the hydrodynamic sizes of polymers and particulates in solution or suspension. It is widely used, among other things, for studying size distributions of polymer and colloid dispersions; for testing theories of polymer dynamics in dilute and concentrated systems; and for studying interactions between macromolecules and colloidal particles in liquid dispersions. The basic work that established the foundation of this technique was done in the 1960s. Pecora has revisited this area over the years-formulating theories, for instance, of scattering from hollow spheres, large cylindrically symmetric molecules and wormlike chains.
An experimental program began in the early seventies resulted in a now classic series of studies on the rotational dynamics of small molecules in liquids. This work, utilizing mainly depolarized DLS and carbon 13 nuclear magnetic relaxation, has had a wide impact in the area of liquid state dynamics.
It was also during this period that the theoretical foundation for the fluorescence correlation spectroscopy technique (FCS) was formulated. Because of recent advances in equipment and materials, this technique has recently been revived and is now a powerful tool in biophysics.
The experimental and theoretical techniques developed for the study of the dynamics of relatively simple small molecule liquids have been used to investigate more complex systems such as the rotation of small molecule solvents in glassy and amorphous polymers. The resonance- enhanced depolarized light scattering technique was also developed in this period.
Extensive studies using depolarized dynamic light scattering (using the Fabry-Perot interferometer) as well as photon correlation spectroscopy, NMR, FCS and small angle X-ray scattering to the dynamics of oligonucleotides have determined the hydrodynamic diameter of DNA and the internal bending angles of the bases. They also provided support for relations relating hydrodynamic parameters to molecular dimensions for short rodlike molecules and “polyelectrolyte effects” on the translational and rotational motions of these highly charged molecules.
A major area of experimental and theoretical study has been the study of the dynamics of rigid and semirigid rodlike polymers in both dilute and semidilute dispersions. The work on translation and rotation of poly (-benzyl-L-glutamate) in semidilute solution is a foremost early work in this area.
The Pecora group has synthesized and studied the dynamics of model
rigid rod/sphere composite liquids. Studies of the translation of dilute spheres through solutions of the rods as functions of the rod and sphere sizes and the rod concentrations have provided the stimulus for more experiment and theoretical work in this area. Transient electric birefringence decay studies of the rotation of dilute rigid rod polymers in suspensions of comparably sized spherical particles have revealed scaling laws for the rod rotation.
A unique feature of part of this work on rigid and semirigid rodlike polymers is the utilization of genetic engineering techniques to construct a monodisperse, homologous series of DNA restriction fragments. These biologically-produced fragments have served as well-characterized model macromolecules for solution studies of the dynamics of semirigid rodlike polymers.
The well-regarded book of Pecora and Berne on dynamic light scattering, first published in 1976, has become a major reference work. It is now a Dover paperback. -
Andrea Pedroza Tobias
Instructor, Pediatrics - General Pediatrics
BioDr. Andrea Pedroza is an instructor in the Department of Pediatrics in the Partnerships for Research in Child Health Lab. She earned a Ph.D. in Global Health from the University of California, San Francisco (UCSF) and a Master of Science in Nutrition from the National Institute of Public Health in Mexico (INSP). Her research focuses on generating evidence for interventions and policy recommendations aimed at improving the dietary quality of children to impact their health and development. Currently, she is employing a community-engaged approach to design nutrition interventions and policy recommendations that aim to reduce the consumption of ultra-processed foods among low-income children to narrow the gap in health disparities.
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Donna Peehl, PhD
Professor (Research) of Urology, Emerita
Current Research and Scholarly InterestsMy research focuses on the molecular and cellular biology of the human prostate. Developing realistic experimental models is a major goal, and primary cultures of prostatic epithelial and stromal cells are my main model system. Our discoveries are relevant to prevention, detection, diagnosis and treatment of benign and malignant prostatic diseases.
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Mark Pegram
Susy Yuan-Huey Hung Professor
Current Research and Scholarly InterestsMolecular mechanisms of targeted therapy resistance in breast and other cancers
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Eldon Pei
Lecturer
Current Research and Scholarly InterestsSpecialisation: world cinema; documentary film; post-war visual cultures; East and Southeast Asian studies; propaganda; media, technology and society; critical theory; postcolonialism
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Rui Pei
Postdoctoral Scholar, Psychology
BioRui (/ˈreɪ/) received her B.Sc. in Cognitive Neuroscience from Brown University, and her Ph.D. in Communication from the University of Pennsylvania. She is interested in understanding how adolescents and young adults make social decisions in the context of psychological and neural development. Her research focuses on social risk taking, or risk taking behaviors that bring social consequences. Some of the questions that her research tries to answer include: what motivates people to take social risks, and how does social risk taking contribute to adolescent health and well-being?
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Rafael Pelayo, MD
Clinical Professor, Psychiatry and Behavioral Sciences - Sleep Medicine
Current Research and Scholarly InterestsSleep Disorders in Adults and Children
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Norbert Pelc
Boston Scientific Applied Biomedical Engineering Professor and Professor of Radiology, Emeritus
Current Research and Scholarly InterestsBroadly, Dr. Pelc is interested in the physics, engineering and mathematics of medical imaging, especially computed tomography, digital x-ray imaging, magnetic resonance imaging, and hybrid multimodality systems. His current research is concentrated in the development of computed tomography systems with higher image quality and dose efficiency, in the characterization of system performance, and in the development and validation of new clinical applications.
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Betina Pelesic, NP
Affiliate, IT Services
BioBetina Pelesic, NP, RN, FNP-BC is a Nurse Practitioner at Stanford Health Care’s Orthopedic Surgery Department. She graduated with her Family Nurse Practitioner (FNP) degree from the Holy Names University. Her area of clinical practice is orthopedic surgery.
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Markus Pelger
Associate Professor of Management Science and Engineering
On Leave from 04/01/2026 To 06/30/2026Current Research and Scholarly InterestsHis research focuses on understanding and managing financial risk. He develops mathematical financial models and statistical methods, analyzes financial data and engineers computational techniques. His research is divided into three streams: machine learning solutions to big-data problems in empirical asset pricing, statistical theory for high-dimensional data and stochastic financial modeling.
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Gary Peltz
Professor of Anesthesiology, Perioperative and Pain Medicine (Department Research)
Current Research and Scholarly InterestsThe laboratory develops and uses state of the art genomic methods to identify genetic factors affecting disease susceptibility, and to translate these findings into new treatments. We have developed a more efficient method for performing mouse genetic analysis, which has been used to analyze the genetic basis for 16 different biomedical traits. We are developing novel methods, and have developed a novel experimental platform that replaces mouse liver with functioning human liver tissue.
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Tara Peña
Postdoctoral Scholar, Electrical Engineering
BioTara Peña is a postdoctoral scholar at Stanford University, where she is working with Prof. Eric Pop and is supported by the NSF MPS-Ascend postdoctoral fellowship. Peña received her Ph.D. (2023) in Electrical and Computer Engineering (ECE) from the University of Rochester, where she won the university-wide Provost’s Fellowship then the nationwide NSF GRFP award. Before obtaining her doctorate, she earned a M.S. degree in ECE from the University of Rochester (2019) and a B.S. degree in Physics from Adelphi University (2017). Peña’s research interests include strain engineering nanomaterials to uncover advanced device structures.
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Jeffrey Peng, MD
Clinical Assistant Professor (Affiliated), Medicine - Primary Care and Population Health
BioDr. Peng is a board-certified specialist in sports medicine and family medicine. He provides care for athletes of all ages and enjoys helping everyday patients achieve and sustain a healthy, active lifestyle. His expertise includes orthobiologics, such as platelet-rich plasma, and ultrasound-guided minimally invasive techniques to treat osteoarthritis, tendinopathies, and other musculoskeletal conditions.
Outside of work, Dr. Peng enjoys reading, exercising, cooking, spending time with his wife, and creating fun mischief with his daughter and son. He is also fluent in Mandarin. -
Jinghong Penny Peng
Clinical Instructor, Radiation Oncology - Radiation Physics
Current Research and Scholarly Interests1. IMRT Treatment planning
2. IGRT Radiation Therapy
3. Real time prostate implant
4. 4D CT and Respiratory Gating Radiation Therapy
5. HDR for breast cancer and GYN cancer
6. Xoft Electronic Brachytherapy -
Michael Penn
Teresa Hihn Moore Professor of Religious Studies and Professor, by courtesy, of Classics
BioMichael Penn, the Teresa Hihn Moore Professor of Religious Studies, is a specialist in the history of early Christianity with a particular focus on middle eastern Christians who wrote in the Aramaic dialect of Syriac.
Professor Penn’s first book, Kissing Christians: Ritual and Community in the Late Ancient Church, was published in 2005 by the University of Pennsylvania Press. In 2015 he published two books on Christian-Muslim relations: Envisioning Islam: Syriac Christians in the Early Muslim World (University of Pennsylvania Press) and When Christians First Met Muslims: A Source Book of the Earliest Syriac Writings on Islam (University of California Press). For these projects Professor Penn has received awards from the John Simon Guggenheim Foundation, the American Council for Learned Societies, the National Endowment for the Humanities, the National Humanities Center, the Institute for the Study of the Ancient World, the British Academy, the American Philosophical Association, the American Academy of Religion, and the Wabash Center for Teaching and Learning.
Professor Penn is currently working on an Andrew Mellon Foundation funded collaboration that uses recent advances in the computerized analysis of handwriting to help analyze ancient Aramaic manuscripts. In addition to this work in the digital humanities, Professor Penn has begun several related projects that focus on the history of Syriac Christianity and the manuscripts they produced.
Before joining Stanford, Professor Penn was on the faculty of Mount Holyoke College. He has also taught at Brandeis University, Haverford College, Bryn Mawr College, and Duke University. He has additional experience as a secondary school teacher, including six years as the director of forensics at Durham Academy High School, where he ran a nationally competitive policy debate team. Professor Penn has also held research positions at Apple Computers, the Weizmann Institute (Israel), the Palo Alto Veterans Hospital, and Ames Research Center, NASA.
Ph.D. (Religion) Duke University (1999)
A.B. (Molecular Biology) Princeton University (1993)
