The incessantly interest in aqueous polymer dispersions (APD) since more than 90 years can be related to the almost unlimited possibilities to tailor APD to specific needs. These proceedings from an international symposium on "Polymer Colloids: Preparation & Properties of Aqueous Polymer Dispersions" held at the Swabian Conference Center (Kloster Irsee, Germany) witness this statement. The 33 contributions cover important aspects of APD such as control of particle size and stabilization, different polymerization technologies, applications as binders, paints, or as supports for proteins and hence, span the whole range from academic to practical.