Mark Krumholz is a world leader in the study of star formation and the interstellar medium. He has contributed fundamentally to our understanding of physical mechanisms that control the rates at which galaxies form stars, the mass distribution of those stars, and the way stars cluster in space and time. These advances have been enabled by new techniques that Krumholz pioneered in computational astrophysics. His standing in the field has been recognised by numerous international awards and his textbook on star formation has shaped the next generation of researchers in the field.