SNS-HFIR User Group Executive Committee Members

Contact the SHUG Executive Committee:

Chair: Daniel Shoemaker

Assistant Professor of Materials Science and Engineering
University of Illinois
Term expires December 2022

Research interests: The Shoemaker Group focuses on discovery and characterization of new electronic and magnetic materials. Neutron-related research includes structure solution, magnetic dynamics, in situ measurements of synthesis and phase transitions, and local structure analysis.


Past Chair: Martin Mourigal

Assistant Professor of Physics
Georgia Institute of Technology
Term expires December 2021

Research interests:  The magnetic dynamics of quantum antiferromagnets and spin-liquids. In his laboratory at Georgia Tech, students and postdocs engage in a broad portfolio of quantum materials techniques, including sample synthesis and characterization, inelastic neutron scattering, and theoretical modelling.



Rana Ashkar

Assistant Professor of Physics
Virginia Tech
Term expires December 2023

Research interests: Structure-property relationships in soft matter, with specific emphasis on polymeric systems and biomimetic lipid membranes. Dr. Ashkar's group is primarily focused on advancing the use of neutron scattering, in conjunction with simulations, to resolve collective structures and dynamics that are critical to the fundamental understanding and practical applications of soft materials.


Adrian BruggerAdrian Brügger 

Director, Robert A. W. Carleton Strength of Materials Laboratory
Associate Research Scientist

Adjunct Assistant Professor, Civil Engineering and Engineering Mechanics, Columbia University
Term expires December 2022

Research interests: Neutron scattering measurements in infrastructure components, packing mechanics, residual stress and contact force mapping of multibody systems, characterization of materials under high temperature (fire), eigenstrain analysis of complex geometries, and curing dynamics of cementitious materials and composites.


Lisa DeBeer-Schmitt

Instrument Scientist at the High Flux Isotope Reactor (GP-SANS)
Oak Ridge National Laboratory
Term expires December 2023

Research interests: Flux-line lattices in unconventional superconductors; magnetism in small-angle neutron scattering; probing long-range magnetic order in materials with rich magnetic phase diagrams and structural ordering in other systems with large scale spacings in on or more dimensions using SANS and related techniques.


Olivier Delaire

Associate Professor of Mechanical Engineering and Materials Science and Physics
Duke University
Term expires December 2021

Research interests: Lattice dynamics in solid materials, in particular the effects of phonon anharmonicity, electron-phonon coupling and spin-phonon coupling. His group makes extensive use of both neutron and x-ray scattering, coupled with first-principles computer simulations to rationalize experimental data and predict material responses.



Geneva LauritaGeneva Laurita

Assistant Professor of Chemistry and Biochemistry
Bates College
Term expires December 2022

Research interests: Understanding the structure—property relationships of inorganic solid state materials, particularly those of relevance to energy and electronics-related technology. Research focuses on solid state synthesis and characterization techniques with an emphasis on neutron and synchrotron X-ray total scattering to gain a detailed understanding of the structure of a material.



Yun Liu

Instrument scientist, NIST Center for Neutron Research (NCNR)
Professor, Chemical & Biomolecular Engineering, University of Delaware
Term expires December 2023

Research interests: neutron/x-ray scattering techniques and theories, biophysics, colloidal science, energy materials, and gas adsorption/desorption in porous materials. Through his academic career, his research projects have greatly benefited from using neutron scattering techniques including the instruments at HFIR and SNS.

Jarek Majewski

Program Director
National Science Foundation
Term expires December 2021

Research interests: Jarek is currently a program director at the Molecular Biophysics Cluster in the Division of Molecular and Cellular Biology at the National Science Foundation. He is on a leave of absence from Los Alamos National Laboratory where, over the past 20 years, he has built a successful x-ray and neutron scattering program to address interfacial structures and properties of materials.




William Ratcliff

NIST Center for Neutron Research (NCNR)
Term Expires December 2021

Research interests: strongly correlated electronic systems, hard condensed matter physics (magnetism, superconductivity, etc.).

Travis Williams

Instrument Scientist at the High Flux Isotope Reactor (HB1, HB3, CTAX)
Oak Ridge National Laboratory
Term expires December 2023

Research interests: Heavy fermion systems, particularly the hidden order system URu2Si2 and the cerium-based non-centrosymmetric magnets CeTX3; materials synthesis and experiments using muon spectroscopy.


Danielle YahneDanielle Yahne

PhD Candidate
Department of Physics
Colorado State University
Term expires December 2021

Research interests: Understanding emergent phenomena in quantum materials with a current emphasis on frustrated magnetism in rare-earth based materials. Using neutron scattering to probe magnetic structures and spin dynamics on very small samples.