Sediment Acoustics is Dr. Robert D. Stoll's seminal book addressing Biot Theory for the modeling of acoustic behavior of ocean sediments. The book is written for seismic-acousticians in the geo-exploration, engineering, oceanographic and underwater sound communities. Robert Stoll, a respected leader in marine geoacoustics for more than forty years, added a brief preface and selected bibliography to this 2006 second printing of his book, first published in 1989. Sediment Acoustics provides an excellent introduction to Biot Theory, the physics underlying the model parameters, and the experimentally measurable predictions of theory. The book constitutes a major synthesis for non-specialists: the results of laboratory, in-situ and numerical modeling studies of seismic-acoustic wave propagation, reflection and attenuation in two-phase poro-visco-elastic media. The text draws from Dr. Stoll's then-20+ year study of shallow subsea porosity and permeability and their effects on seismic-acoustics over the 5-1500 Hz band and has much to offer those interested in better understanding of the Biot model. It is written at the graduate literature review level but includes enough tutorial sections and references to be useful as a text for new researchers in seismic modeling, quantitative seismic stratigraphy, offshore marine geotechnique, underwater acoustics and sonar, and ground-interacting aeroacoustics.