David Rolnick is a first-year Ph.D. student in Applied Math at MIT. His mathematical interests include machine learning, graph theory, and combinatorics.  David earned his B.S. from MIT in 2012 in Mathematics and Music, and continues to study and perform as an opera singer.  He is also fascinated by insects and occasionally travels to Brazil for entomology projects.  David is natural history columnist for The Tech and an instructor with the online math teaching company Art of Problem Solving.