Alex Grossmann (1930-2019) carried out pioneering work on wavelet analysis with Jean Morlet, demonstrating its applicability to signal processing. Grossmann subsequently made significant contributions to mathematics, physics, computer science, and biology. This contributed volume features chapters written by collaborators of Grossmann and researchers whom he influenced in a decisive way. Just as Grossmann's work spanned numerous subjects, so do the chapters here, with a focus on theoretical physics, wavelets and mathematical analysis, and theoretical biology and genetics. Serving as an introduction to the volume are a scientific biography of Grossmann, as well as a more personal biography written by his son. Readers from any of the fields on which Grossmann had an impact will find this an insightful and informative work.