I chose to focus on computational biology because I had an amazing professor that I wanted to work with. That being said, an amazing professor != amazing advisor... something I discovered when trying to finish my PhD and he decided to take a sabbatical to Kenya to do missionary work :(. I got enough statistics and machine learning experience in graduate school to be doing machine learning research now as part of the…
True about switching fields with ml, after a while in evolvable hardware I did a joint PhD in geography + computer science, and have been making socioeconomic simulations of various kinds for the last 10 years. Nowadays I'm trying to reacquaint myself with core cs research, as looking for a lectureship I realized I'm always going to be stronger teaching cs than geography.