John Berthels


I'm John Berthels. I am a systems designer and coder. You can find details of my past employment on LinkedIn.

I'm currently available for freelance work. If you've got an interesting problem, please contact me to discuss it.

Current Technical Interests

Past Projects

It's currently obsolete and orphaned, but I am still quite proud of the exmap memory analysis tool, which used a kernel loadable module to find exact memory usage (and account for page sharing) and reversed the ELF loader's mappings to work out exactly which bits of which executable where in which page of memory.


You can get hold of me by email or google talk using my firstname.lastname at gmail. You could also try tweeting at me.