One of my favorite coworkers had to leave because of (USA) visa issues. Her student visa expired and our startup's attempts to get her an H1B ended in failure. It's really sad! She was a good friend as well as one of the smartest people I know.
Now I have:
1. a recommendation for a really good data scientist, who will be looking for a job in Canada or Europe soon
2. a job opening for a really good data scientist to work on solar power in the US
Direct message me if interested in either.