Oliver M. O’Reilly is a professor of mechanical engineering at the University of California, Berkeley. He has taught at this institution since 1992 and received multiple teaching awards including the Distinguished Teaching Award of the University of California, Berkeley. He is the author of two other textbooks and coauthor of a research monograph on discrete elastic rods. The author’s research interest lie in a variety of topics including the dynamics of soft robots, rotations of rigid bodies, mathematical models for the mechanics of plant growth, the dynamics of toys, and the failure of shoelace knots.