David DeMille joined the department in October of 2024, moving from the University of Chicago. DeMille is a world-leading Atomic, Molecular, and Optical (AMO) physicist who has developed novel methods of precision measurement to probe for the existence of new fundamental particles and forces. Many of his experiments rely on the amplification of effects, due to new forces, that are present in polar molecules.  To enable these measurements—and for other possible applications in quantum science—he has pioneered techniques to manipulate the quantum states of diatomic molecules, including trapping and cooling molecular gases to ultralow temperatures. DeMille was elected a member of the National Academy of Sciences in 2024, and he is the recipient of the 2024 Norman F. Ramsey Prize in Atomic, Molecular and Optical Physics and in Precision Tests of Fundamental Laws and Symmetries, a prize awarded by the American Physical Society.  DeMille has shared his expertise in over 250 invited talks at department colloquia, seminars, and conferences – including several at JHU in years past.