Ellen D. Williams (scientist)

Williams' research in experimental surface science explores fundamental issues in statistical mechanics, particularly including practical applications nanotechnology. Her research group pioneered applications of direct imaging techniques for atomic-scale structures on surfaces. She worked closely with theorists to design experiments to address theoretical and conceptual questions important to the fields of catalysis, thin film growth and nano-electronics. She has published over 200 academic articles, which have been cited over 8000 times. Her most widely cited work includes at least four areas of fundamental research (see Selected Publications below); structure-transport relationships in graphene, surface morphology and step fluctuations, electronic interactions with surface defects, and adsorbate-interactions.

In parallel with her academic career, Williams has worked extensively in providing technical advice to the U.S. government, primarily through the Departments of Energy and Defense. As a result of her experience, in 2009 she was asked to lead a study on issues of verification of nuclear testing,[9] which was one of the concerns cited in the Senate decision not to ratify the treaty in 1999. The resulting report,[10] reviews the verification capabilities in the US and at the Comprehensive Nuclear Test-Ban Organization (CTBTO), and shows that detection capability advanced significantly over the years after the 1999 U.S. decision not to ratify. The report places the state-of-the art detection capability in the context of different types of proliferation threats, and thus provides a valuable context for decision makers. The report also emphasizes the importance of sustaining and continuing to advance technical capabilities for verification, both in the U.S. and at the CTBTO. Williams is the vice-chair of JASON, an independent group of scientists offering advice to the US government on key science and technology issues.[11]

At BP, Williams worked in Group Technology, where she was responsible for assurance of technology programs, and strategic research and program development. Early in her tenure, she set up the initial advisory structure for BP's Gulf of Mexico Research Initiative[12] Within the company, she advocated for increased implementation of advanced computational approaches in molecular chemistry, fluid dynamics, and distributed sensing and ‘big data’ analysis. She also led a strategic multi-university research program on natural resource constraints in the context of energy (the Energy Sustainability Challenge),.[13] In addition to the extensive University research publications that resulted from the program, the ESC team also created three reference booklets on energy-resource issues, “The ESC Materials Handbook",[14] “Water in the Energy Industry,” [15] and “Biomass in the Energy Industry”.[16] Williams has spoken widely about the need for advances in Science and Technology to sustainably supply the energy the world needs.[17]

Prior to Senate confirmation for her role in ARPA-E, Williams served as a senior advisor to the Secretary on DOE's technology transfer policies, issues, and plans. She established the Department's new Office of Technology Transitions[18] to expand the economic impact of the Department's extensive Research and Development activities.

Williams joined ARPA-E just before its sixth anniversary, as the Agency's portfolio of active and alumni technology development programs[19] were forming a pipeline of energy technology innovation that ranges from early stage to more mature stages of technical readiness. As a result of ARPA-E's unique operational model, in which projects are managed both against ambitious technical and commercial goals, increasing numbers of the mature projects were proving attractive to follow-on investors, had products in field testing, or had early stage commercial products.[20][21] During her tenure at ARPA-E, Williams focused on streamlining ARPA-E's administrative processes to better support the innovation teams working under ARPA-E funding, on strengthening the support given teams in preparing their new technologies for commercial uptake, and on establishing rigorous assessment practices. Under her direction, the Agency produced the first two of a planned annual series of Impact Assessments, which present the challenges, technical achievements, and pathways to commercial impact for selected ARPA-E projects.[22][23]

Applying the experimental approaches developed through her career, Williams worked with collaborator Michael Fuhrer to develop key early understanding about structural fluctuations and defect interactions in defining graphene's properties.

Williams’ research group discovered the remarkable ability of silicon surfaces to undergo reversible micron-scale changes in structure, and demonstrated how such changes are thermodynamically defined by changes in the free-energy of steps on the surface. The group's subsequent experimental work elegantly placed observations of structures and fluctuations of steps in a universally applicable theoretical formalism.

Williams’ group also explored the interaction of surface structure with electric fields and currents. They demonstrated how the incredibly small momentum-transfer due to an electron colliding with an atom can none-the-less cause micron-scale rearrangements of the material near the surfaces.

Williams’ graduate work explored how catalytically important molecules such as carbon monoxide and hydrogen interact with metal surfaces. She made seminal observations of how such molecules organize on surfaces and how the molecules (which are called ‘adsorbates’ once they are on the surface) interact with each other. The nature of such adsorbates and their relationship to the formation of structures on surfaces informed all of Williams’ subsequent work.