I'm a professor of mathematics at the University of North Carolina Asheville. I've also done a fair amount of consulting work over the years focusing on scientific and data visualization.
I'm happy to be part of the first Observable Ambassador's cohort.
Glad you like it! The original GPX files, whether they come from my Garmin GPS watch or my iPhone, tend to be quite large. They actually work just fine in the notebook, when I run from my machine but I still figured it would be a good idea to reduce them, which I did using https://gpx.studio/.