I am an engineer, a material scientist, a physicist, and an educator. I am interested in using x-ray light to study a material’s properties and its behavior during heating, working, deformation, etc. Inclusivity, diversity, and equality in STEM are incredibly important to me.

Dr. rer. nat. Margaret Kolbe Annellen Koker

undergraduate student educator and materials researcher

Assistant Professor of Physics at Lawrence University
(2021 – present)

Previous Positions in Research and Teaching

Visiting Assistant Professor of Physics at Lawrence University
(2018 – 2021)

Engineering Lecturer at Cornell University
(Summer 2018)

Beamline Scientist at GSECARS (Advanced Photon Source, University of Chicago)
(2016 – 2018)

Research Associate at CHESS (Cornell University)
(2015 – 2016)

Postdoctoral Research Fellow at CHESS (Cornell University)
(2013 – 2015)


Doctor rerum naturalium at Max Planck Institute for Intelligent Systems (formerly Metals Research) & Universität Stuttgart
Department of Chemistry (concentration of Materials Science), working with Dr. Ing. Eric J. Mittemeijer.

Master of Science at University of Illinois
Department of Mechanical Engineering, working with Dr. Jonathan A. Danzig and Dr. Armand J. Beaudoin. Defining the Thermo-mechanical Processing Window for Hot-Rolling of Rate Sensitive Materials

Bachelor of Science at Boston University
Department of Mechanical Engineering


N. Y. Juul et al., Elastic Interaction Between Twins During Tensile Deformation of Austenitic Stainless Steel. Scripta Materialia120, 1–4 (2016).

N. Y. Juul et al., Measured Resolved Shear Stresses and Bishop-hill Stress States in Individual Grains of Austenitic Stainless Steel. Acta Materialia141, 388–404 (2017).

E. Fontes, R. Ryan, M. K. A. Koker, Creating a Brighter Future for Chess: 2016 Users’ Meeting and Science Workshops Report. Synchrotron Radiation News29, 30–33 (2016).

N. Chen, M. K. A. Koker, S. Uzun, M. N. Silberstein, In-situ X-ray Study of the Deformation Mechanisms of Non-woven Polypropylene. International Journal of Solids and Structures97-98, 200–208 (2016).

W. Tang et al., A Study of Stress Relaxation in AZ31 Using High-energy X-ray Diffraction. Acta Materialia101, 71–79 (2015). 

D.-H. Ha et al., Solid–Solid Phase Transformations Induced Through Cation Exchange and Strain in 2D Heterostructured Copper Sulfide Nanocrystals.. Nano Letters14, 7090–7099 (2014).

M. K. A. Koker, E. Fontes, CHESS Facility Update and Upgrade Planning. Synchrotron Radiation News27, 25–29 (2014).

M. K. A. Koker, J. Schaab, N. Zotov, E. J. Mittemeijer, X-ray Diffraction Study of the Reverse Martensitic Transformation in NiTi Shape Memory Thin Films. Thin Solid Films545, 71–80 (2013).

M. K. A. Koker, U. Welzel, E. J. Mittemeijer, Elastic Mechanical Grain Interactions in Polycrystalline Materials; Analysis by Diffraction-line Broadening. Philosophical Magazine93, 2967–2994 (2013).

M. K. A. Koker, U. Welzel, E. J. Mittemeijer, Measurement of X-ray Diffraction-line Broadening Induced by Elastic Mechanical Grain Interaction. Journal of Applied Crystallography47, 391–401 (2014).