 In 2014, Gabrielse, as part of the ACME collaboration with John Doyle at Harvard and David DeMille at Yale, measured the electron electric dipole moment to over an order of magnitude over the previous measurement using a beam of thorium monoxide, a result which had implications for the viability of supersymmetry.Gabrielse was also one of the discoverers of the Brown-Gabrielse invariance theorem, relating the free space cyclotron frequency to the measureable eigenfrequencies of an imperfect Penning trap.The theorem's applications include precise measurements of magnetic moments and precise mass spectrometry.