Kayser is an associate professor whose research focuses on the development of vaccines and biologics. Specific areas of interest include: The development of vaccines and biologics; Biosimilars and next-generation biologics (biobetters); Therapeutic monoclonal antibodies (mAbs); Bispecific mAbs; Nanoparticle–mAb conjugates; Antibody–drug conjugates; Viruses: rabies, influenza, Ebola, Crimean–Congo haemorrhagic virus, and MERS; Vaccines: influenza, rabies, MERS, etc.; The formulation of biologics; Protein folding and aggregation; The stabilization and formulation of biotherapeutics and vaccines; The molecular engineering of biopharmaceutical products; Formulation development (e.g., ionic liquids); The development of novel methods to study biologics and vaccines; Nucleation and crystallization; Time-resolved fluorescence spectroscopy; and Biophysical methods.