I center my discussion of the papers in this issue of Psychoanalytic Inquiry on Peter Fonagy's evocative proposal that Joseph Sandler's theories were crucial for a “quiet revolution” in psychoanalysis. The writers in this issue are unanimous in their praise and appreciation of Sandler's many contributions. I consider the validity of characterizing Sandler as a pivotal or transitional theoretician, especially as his work bears on the contemporary shift from a one- to a two-person psychology.