From 1956 to 1961 he held a position at the Radiation Laboratory in Berkeley, working there on spins and magnetic properties of radioactive nuclei using the Rabi beam method. Lipworth joined the Brandeis physics department in the fall of 1961, a time when its graduate program was only five years old and entirely oriented towards theoretical physics. Together with Stephan Berko he succeeded in building up an impressive experimental research program in a very short time. A magnetic resonance apparatus with a high electric field allowed him to study the Stark shifts in the Zeeman and hyperfine structure of atoms.