I am a theoretical computer scientist who has worked on parallel architectures, graph algorithms, computational geometry, and symbolic computation. In particular, I like to develop algorithms and solve problems in graph theory. As of 2000, I began working in computational biology and bioinformatics with collaborators in the life sciences, especially in plant science and plant pathology. I have primarily worked with sequence data, such as genomes and RNA-Seq, and with biological networks, such as gene regulatory networks. More recently, I have done research in computational epidemiology, with an emphasis on RNA viruses, such as the COVID virus, and their mutations. I have studied viral genomic sequences and the graphs that result from considering the mutations of viruses in genome space.