  After some personal recollectioms about Rudolf Haag and his thoughts which
led him to "Local Quantum Physics", the present work recalls his ideas about
scattering theory, the relation between local observables and localized fields
and his contributions to the physical aspects of modular operator theory which
paved the way for an intrisic understanding of quantum causal localization in
which fields "coordinatize" the local algebras. The paper ends with the
presentation of string-local fields whose construction and use in a new
renormalization theory for higher spin fields is part of an ongoing
reformulation of gauge theory in the conceptual setting of Haag's LQP.
