 In his general AGN studies, he has investigated AGN winds, the X-ray 
properties of the first quasars, and extreme AGN populations
(e.g., Narrow-Line Seyfert 1 galaxies and weak-line quasars).He has also worked on investigations of the 
cosmic microwave background radiation and the effects of neutron-star 
and black-hole natal kicks.Brandt is an author of more than 
500 research papers on these subjects.