Pustelny leads Krakow's optical-magnetometry group, developing atomic magnetometers, zero-field NMR and running/analysing the GNOME dark-matter network. 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.