SLAC National Accelerator Laboratory
Showing 701-750 of 1,925 Results
-
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. -
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.
-
Meredith A. Henstridge
Associate Scientist, SLAC National Accelerator Laboratory
BioMeredith received a PhD in Applied Physics from the University of Michigan in 2018 and held a position as a postdoctoral scientist at the Max Planck Institute for the Structure of Dynamics and Matter in Hamburg, Germany from 2018-2022. Her expertise spans across the interfacing of metamaterials with nonlinear optics, spontaneous and coherent Raman scattering, nonlinear phononics, and ferroelectrics.
Meredith's current research at SLAC focuses on developing near-field-based approaches for delivering high-field mid-infrared and THz-frequency sources for experiments with LCLS-II, the development of efficient laser-driven devices for enabling high temporal-resolution experiments at the Ultrafast Electron Diffraction (MEV-UED) beamline, and efforts towards realizing an electron beam-based source that can deliver multi-cycle mid-infrared pulses at both high energies and high repetition rates for experiments with LCLS-II.
Meredith is one of the primary SLAC laser scientists supporting time-resolved experiments on the X-ray Pump-Probe (XPP) beamline, and she also supports the laser team at the Macromolecular Femtosecond Crystallography (MFX) beamline.
Meredith's google scholar page can be found here:
https://scholar.google.com/citations?user=Ab0xESYAAAAJ&hl=en -
Thomas Hersbach
Project Scientist, SLAC National Accelerator Laboratory
BioThom Hersbach is a Policy Fellow at the Stanford Woods Institute for the Environment and a Project Scientist at SLAC National Accelerator Laboratory. His interests span all areas of the energy transition, and his work ranges from basic science studies of water splitting catalysts to exploring the socio-technological contexts of the hydrogen economy and the future chemical refinery complex.
In his free time, Thom enjoys primal movement, running, weightlifting, (guerilla) gardening, baking sourdough bread, brewing coffee/beer, and reading about soil ecology. -
Keith Hodgson
David Mulvane Ehrsam and Edward Curtis Franklin Professor of Chemistry and Professor of Photon Science
On Leave from 10/01/2025 To 03/31/2026BioCombining inorganic, biophysical and structural chemistry, Professor Keith Hodgson investigates how structure at molecular and macromolecular levels relates to function. Studies in the Hodgson lab have pioneered the use of synchrotron x-radiation to probe the electronic and structural environment of biomolecules. Recent efforts focus on the applications of x-ray diffraction, scattering and absorption spectroscopy to examine metalloproteins that are important in Earth’s biosphere, such as those that convert nitrogen to ammonia or methane to methanol.
Keith O. Hodgson was born in Virginia in 1947. He studied chemistry at the University of Virginia (B.S. 1969) and University of California, Berkeley (Ph.D. 1972), with a postdoctoral year at the ETH in Zurich. He joined the Stanford Chemistry Department faculty in 1973, starting up a program of fundamental research into the use of x-rays to study chemical and biological structure that made use of the unique capabilities of the Stanford Synchrotron Radiation Lightsource (SSRL). His lab carried out pioneering x-ray absorption and x-ray crystallographic studies of proteins, laying the foundation for a new field now in broad use worldwide. In the early eighties, he began development of one of the world's first synchrotron-based structural molecular biology research and user programs, centered at SSRL. He served as SSRL Director from 1998 to 2005, and SLAC National Accelerator Laboratory (SLAC) Deputy Director (2005-2007) and Associate Laboratory Director for Photon Science (2007-2011).
Today the Hodgson research group investigates how molecular structure at different organizational levels relates to biological and chemical function, using a variety of x-ray absorption, diffraction and scattering techniques. Typical of these molecular structural studies are investigations of metal ions as active sites of biomolecules. His research group develops and utilizes techniques such as x-ray absorption and emission spectroscopy (XAS and XES) to study the electronic and metrical details of a given metal ion in the biomolecule under a variety of natural conditions.
A major area of focus over many years, the active site of the enzyme nitrogenase is responsible for conversion of atmospheric di-nitrogen to ammonia. Using XAS studies at the S, Fe and Mo edge, the Hodgson group has worked to understand the electronic structure as a function of redox in this cluster. They have developed new methods to study long distances in the cluster within and outside the protein. Studies are ongoing to learn how this cluster functions during catalysis and interacts with substrates and inhibitors. Other components of the protein are also under active study.
Additional projects include the study of iron in dioxygen activation and oxidation within the binuclear iron-containing enzyme methane monooxygenase and in cytochrome oxidase. Lab members are also investigating the role of copper in electron transport and in dioxygen activation. Other studies include the electronic structure of iron-sulfur clusters in models and enzymes.
The research group is also focusing on using the next generation of x-ray light sources, the free electron laser. Such a light source, called the LCLS, is also located at SLAC. They are also developing new approaches using x-ray free electron laser radiation to image noncrystalline biomolecules and study chemical reactivity on ultrafast time scales. -
Matthias C. Hoffmann
Lead Scientist, SLAC National Accelerator Laboratory
Current Role at StanfordLead scientist in the LCLS Laser Science Department.
Group lead for Mid-infrared and THz sources.
Develops and supports THz pump-X-ray probe experiments at LCLS and in-house research on ultrafast spectroscopy with intense THz pulses. -
Mark J. Hogan
Affiliate, Accelerator
BioI am a Senior Staff Scientist at SLAC National Accelerator Laboratory. I earned my Ph.D. in physics from UCLA in 1998 under Claudio Pellegrini working on Self Amplified Spontaneous Emission free electron laser experiments at UCLA and Los Alamos National Laboratory. I joined SLAC in 1998 to work on the beam driven plasma wakefield accelerator experiments at the Final Focus Test Beam facility. I have subsequently served as the leader of the Advanced Accelerator Research Department and the Chief Scientist for the FACET Facility. I am now the Director of the FACET-II National User Facility and the FACET and Test Facilities Division Director. I am a Fellow of the American Physical Society, a Senior Member of the IEEE. In 2013 received the IEEE Particle Accelerator Science and Technology Award and in 2024 was awarded the John Dawson AAC Prize. My personal research interests seek to develop ideas for the application of plasma acceleration to linear colliders and free electron lasers.
-
Michael Hoganson
Research Technical Manager, SLAC National Accelerator Laboratory
Current Role at StanfordAdvanced Prototyping and Fabrication Department Head
-
Kerrie Holguin
Admin Services Administrator, SLAC National Accelerator Laboratory
Current Role at StanfordOperations Lead
Technology Transfer and Strategic Partnerships
SLAC National Accelerator Laboratory
