John is an observational astronomer who primarily uses HST and Subaru data. Over his time as a researcher, he has acquired a set of skills and knowledge he uses regularly, such as:

• Accessing MAST
• Reducing HST CCD data
• Reducing Subaru data using a legacy pipeline
• Maintaining and reading legacy code 
• Using SExtractor 
• Using IRAF to model galaxy light profiles
  • Creating masks
  • Measuring profiles of point sources
  • Creating completeness measurements
• Using APT (aperture photometry tool) to look at individual point sources
• Using DS9
  • Displaying images
  • Layering images
  • Creating region files/overlays
  • Sanity checking outputs
  • Visually inspecting areas/point sources of interest/conflict
• Writing Python code with powerful libraries:
  
  • NumPy
  • pandas
  • SciPy
  • Astropy
  • Astroquery
  • Scikit-learn
  • pandas
  • AstroML
• Planning and executing observations with ground-based telescopes