To keep us all safe, I am currently seeing students remotely, which means I can work with students all over the world. This will continue at least until I feel it is safe to add the option of seeing students in person again, at which point I may open an office in or near Lexington, MA USA in addition to continuing to serve remote students.
Here's a really great video on the math of epidemics, particularly COVID-19, from the always fantastic 3blue1brown. I also wrote a blog post showing the math of how we stop the spread of this disease. It's based on my earlier post about herd immunity using measles as an example.