Riis co-leads EQOP, developing unshielded and MEMS-based optically pumped magnetometers (double-resonance, free-induction-decay) for geomagnetic sensing, magnetocardiography and magnetomyography, alongside atomic clocks and cold-atom devices. 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.