PIXE Group Alumni

Alumni/Alumnae since 2000

Image Name & Information
Stefan Andrushenko Stefan Andrushenko (BSc University of Guelph)
  • Initial developer of GUAPX_Win as research assistant
  • APXS experimental set-up, development and simulation programming
  • Now a Systems Analyst in food distribution industry
Patrick Bonnick Patrick Bonnick (BSc University of Guelph, PhD Dalhousie)
  • Extension of the GUPIX database as summer scholar
  • PDF at University of Waterloo
  • Now working at the Toyota Research Institute of North America as a Battery Research Scientist
Nick Boyd Nick Boyd (BSc, MSc University of Guelph)
  • Post-BSc research assistant: Primary developer of GUI for GUPIXWIN V1.2-V2.4
  • Now APXS Operations Manager, University of Guelph
Willy Brown-Bury Willy Brown-Bury (MSc University of Guelph)
  • Refinement of the Monte Carlo photon scatter code as diagnostic for water in Martian soils and rocks
  • Refinement of the GUAPX spectrum fitting code through a physics-based treatment of the Compton scatter feature
  • Now a high school Physics Teacher
Daniel Cureatz

Daniel Cureatz (BSc, MSc University of Guelph)

  • Refinement of the GUPIX Treatment of Multiple Ionization Satellites and Detector Non-linearity
Erin Flannigan Erin Flannigan (BSc, MSc University of Guelph)
  • Design, construction and calibration of accelerator-based PIXE system for smulating Mars rover APXS
  • Mineral phase effects in PIXE measurements of element concentrations terrestrial geostandards and equivalents of high-alkali Martian rocks
  • Research assistant, PIXE group, University of Guelph
  • Now a PhD student in Accelerator Mass Spectrometry at University of Ottawa
Brianna Ganly Brianna Ganly (BSc, PhD University of New South Wales, Australia)
  • Visiting PhD student from Australia in summers of 2015 and 2016
  • Worked on non-linear effects in silicon drift detectors
  • ​Staff scientist at CSIRO, Sydney, Australia
Chris Heirwegh Chris Heirwegh (PhD and PDF University of Guelph)
  • Fundamental physics underlying PIXE analysis: fluorescence yields, multiple ionization satellites
  • Non-linearity in Si-based x-ray detectors
  • Now Staff scientist at Cal. Tech. and member of PIXL instrument team on NASA Mars 2020 mission
Natasha Holmes Natasha Holmes (BSc, MSc University of Guelph)
  • Summer scholar: Underlying physics of the APXS
  • Now assisstant professor of Physics at Cornell University
Theo Hopman Theo Hopman (PhD University of Guelph)
  • Monte Carlo modeling of X-ray detector response function
  • Dedicated monochromator for detector response studies
  • Diagnosis of geometric properties of X-ray detectors
  • Science teacher
Brian Jones Brian Jones (PhD University of Surrey)
  • Studies of the Cambridge Scientific Digital processor
  • L subshell ionization, fluorescence and Coster-Kronig yields
  • APXS development and data analysis
  • Now Head of Accelerator Facility, KVI Center for Advanced Radiation Technology, University of Groningen , Netherlands
May Lee May Lee (BSc, MSc University of Guelph)
  • Monte Carlo photon scatter code for quantitative determination of water in Martian soils and rocks
  • Now in the insurance industry
Christiane Mallett Christiane Mallett (BSc University of Guelph, MSc, PhD at University of Western Ontario)
  • Monte Carlo simulation of the scatter components in APXS spectra for water determination on Martian surface
  • Now Research Associate, Dept. of Radiology, Michigan State University. 
Emily Neild Emily Neild (BSc Trent University)
  • NSERC summer scholar for 3 years
  • Data analysis for Mars Science Lab APXS Team
  • Now graduate student, University of Tennessee
Zdenek Nejedly Zdenek Nejedly (PhD Czech Technical University)
  • Automated aerosol analysis by PIXE, LIPM and forward scatter
  • Software for PIXE data accumulation and batch analysis
  • Software for accelerator and radiation monitoring 
  • Provision of micro-PIXE and PIXE analyses to collaborators of the GPG
  • Now systems analyst with Computing and Communication Services , U of Guelph
Melissa Omand Melissa Omand (BSc University of Guelph, PhD Scripps Institute of Oceanography)
  • Post-BSc research assistant: Mars Exploration Rover: Monte Carlo simulation of X-ray yield vs. concentration relationships.
  • Now faculty member, Graduate School of Physical Oceanographer, University of Rhode Island
Renato Pardo Renato Pardo (MSc University of Guelph)
  • Spectrum fitting accuracy issues in application of GUAPX code to APXS calibration spectra
  • Now PhD student in Geography, University of Guelph
Glynis Perrett Glynis Perrett (BSc, PhD University of Guelph)
  • Calibration of the Mars Science Laboratory APXS using the GUAPX-Win code
  • Re-calibration of the scatter ratio method for determination of mineralogically bound water in the Martian regolith
  • Subsequently Research Associate in Mars Exploration Rover team at Cornell University 
Leanne Sargent

Leanne Sargent (BSc, MSc University of Guelph)

  • Extension and application of the PIXE system for emulation of the Mars APXS
Stehanne Taylor Stehanne Taylor (BSc, MSc University of Guelph, PhD McGill)
  • Post-MSc research assistant 
  • Calibration of the APXS for analysis of Martian rocks and soils
  • Monte Carlo computation of X-ray detector efficiency
  • Now staff scientist with Fisheries and Oceans Canada, Halifax
  Dave Thomson (MSc University of Guelph)
  • Monte Carlo code to predict X-ray yields from the Mars science Laboratory APXS
  • Now Instructor at Conestoga College
Mike Vormwald Mike Vormwald (BSc University of Guelph)
  • Development of GUPIXWIN V1.1: graphics; output; batch mode
Alanna Weatherstone Alanna Weatherstone (BSc University of Guelph)
  • Post-BSc research assisstant
  • Development of GUPIXWIN V1.1: C++ coding; screen design; data input


  • Johnny Ferraz Dias, Federal University of Rio Grande do Sul, Porto Alegre, Brazil
  • Matjasz Kavcic, Institut Josef Stefan, Llubljana, Slovenia
  • Stjepko Fazinic, Institut Ruder Boskovic, Zagreb, Croatia
  • Ralf Gellert, University of Guelph, Ontario, Canada
  • Mariek Schmidt, Brock University, Ontario, Canada
  • Brianna Ganly, CSIRO, Sydney, Australia
  • J. A. Berger, University of Guelph, Ontario, Canada
  • Glynis Perrett, Cornell University, New York, USA
  • Chris Heirwegh, NASA Jet Propulsion Laboratory, California, USA
  • John G. Spray, University of New Brunswick
  • Lucy M. Thompson, University of New Brunswick