Sahal Yacoob came to Northwestern University with a Master’s degree in Applied Mathematics from the University of Cape Town.  He was a Luminosity expert on the DO experiment and Fermilab and measured the W boson mass with and uncertainty of 0.025%.  After graduation he joined the new South African effort on the ATLAS experiment at CERN, first at the University of Wittwatersrand, then at the University of KwaZulu-Natal.    He has moved back to Cape Town as a Lecturer in Physics on ATLAS as of summer 2015.  See news from Sahal on the ATLAS Blog.


Sahal at the International Conference on High Energy Physics in Valencia Spain.
Sahal at the International Conference on High Energy Physics in Valencia Spain, July 2014.
Sahal scrutinizing the ATLAS experiment at CERN.
Sahal scrutinizing the ATLAS experiment at CERN.

Brandon Walker graduated from Northwestern in 2010 with Bachelor’s degrees in Physics and Astronomy and in Mathematics.  He did his honors thesis in the Schellman group on `An Algorithm for Particle Tracking and Analysis of Muons in the Main Injector Experiment v-A (MINERvA).”


He is currently a doctoral student in Medical Physics at the University of Wisconsin at Madison.

Brandon Walker (center) helps assemble the MINERvA detector 300 feet below Fermilab
Brandon Walker (center) helps assemble the MINERvA detector 300 feet below Fermilab

For his PhD, he’s designing and building a modular multi-source electron beam scanner for high speed computed tomography and 3D printing applications. The system would enable ultra-fast CT scans for improved image quality in cardiac imaging and could be a game changer for 3D printing. The Wisconsin Alumni Research Foundation (WARF) has filed two patents for the project, one in 2014 and another in 2015 (patents pending).

He has also co-founded 2 startup companies. Formula Database, GelCombs and has his own consulting company that does quality assurance for radiation and diagnostic imaging products.



Dr Andrew Kobach MS-2011


Andrew Kobach received his Master’s degree with the Schellman group at Northwestern in 2011 for his measurement of Z+gamma production at the DO experiment at Fermilab. He received a Department of Energy Office of Science Graduate Fellowship to support this work.

He recently completed his doctorate in Theoretical Physics with André de Gouvêa at Northwestern and will be taking a postdoctoral position at UC San Diego in Fall 2015.


Dr. Geralyn (Sam) Zeller – PhD 2002


Sam Zeller at Fermilab
Sam Zeller at Fermilab

Dr. Geralyn (Sam) Zeller received a Ph.D. in particle physics from Northwestern University working with Heidi Schellman and Kevin McFarland (Rochester) in 2002. Her dissertation, a measurement of the weak mixing angle in neutrino deep inelastic scattering, earned a Mitsuyoshi Tanaka Dissertation award in Experimental Particle Physics in 2003. She worked at both Columbia University and Los Alamos National Laboratory prior to becoming a staff scientist at Fermi National Accelerator Laboratory in 2009. She has participated in six different experiments studying the properties of neutrinos over the course of her career, including NuTeV, MiniBooNE, SciBooNE, MicroBooNE, ArgoNeuT, and DUNE. She recently received a U.S. Department of Energy Office of Science Early Career award to further the research of using liquid argon time projection chambers to study neutrino interactions and is currently co-spokesperson for the MicroBooNE experiment.

Her current research focuses on neutrino-nucleus interactions and precision neutrino oscillation measurements.