Anne G. Fisher, ScD, OT, FAOTA, is an internationally recognized expert in theory, functional assessment, and instrument development who pioneered the use of Rasch analysis in occupational therapy. Her research focuses on the development of occupation-centered tools that support the implementation of occupation-based and occupation-focused occupational therapy services. She developed the Occupational Therapy Intervention Process Model, a professional reasoning model that enables occupational therapists to implement occupation-based, occupation-focused, and client-centered services to clients. Fisher was recipient of the 1997 Eleanor Clarke Slagle Lectureship for distinguished contributions to theory and functional assessment. Read Fisher’s Slagle Lecture.