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I am currently a professor in the Department of Biology at Penn (http://kim.bio.upenn.edu). I am something of a generalist in biological sciences, having worked on topics ranging from population dynamics, mathematical phylogenetics, fruit-fly development, yeast cell cycles, and genomic technologies. In the last 12 years or so, I have been working in a new field called "Single Cell Biology" where we are developing new techniques to make measurements on individual cells and then make inferences on their assembly.
But, regardless of our published works, I like to think of myself as a "Theoretical Biologist"--at least this is what we used to call people like me before the advent of bioinformatics, computational biology, systems biology, etc, etc. My original introduction to category theory was when I accidentally picked up a copy of the mis-leadingly titled "Mathematical Physics" by Robert Geroch. My brother, Minhyong Kim, who is an actual mathematician, has always told me vignettes of category theory, so this time I am actually hoping to learn more than just parroting his words.