His fields of interest include biopharmacy, pharmaceutical technology and physical pharmacy in general and more specifically formulation development, including pharmacokinetic considerations, of small and large molecule drug products. Over the years his interest has focused on: site specific drug delivery with colloidal-nanosized carrier systems/self-assembling systems (in combination with monoclonal antibodies), purification, characterization and stabilization of monoclonal antibodies and other pharmaceutical proteins and peptides, receptor-ligand interactions, delivery systems for small molecules, peptides and proteins, pharmaceutical aspects of vaccines (adjuvanticity/antigen presentation and delivery), immunogenicity of pharmaceutical proteins.