I have been working for years on Natural Language parsing technology, implementing a tool: XIP (Xerox Incremental Parser) that was used in my research team for over 16 years. As NLP was quickly shifting into Deep Learning, I moved my interest to programming languages, which appeared to me as a natural continuation of my work on grammars. I have so far implemented two languages, which are now in Open Source: Tamgu and LispE (github.com/naver/tamgu and github.com/naver/lispe).