Jackson Kimball uses atomic magnetometry (including SERF and nonlinear magneto-optical rotation) for tests of fundamental symmetries and ultralight dark-matter searches; he co-leads GNOME and contributes SERF magnetometry to CASPEr. This vapour-phase approach reaches femto-to-picotesla sensitivities complementary to NV-center diamond ensemble quantum sensors (DEER, nano-NMR, T1 relaxometry) that operate near the pT/sqrt(Hz) regime.