Griffin holds the Rosenberg Chair in Quantum Sensing and leads Strathclyde work on chip-scale/MEMS optically pumped magnetometers, unshielded operation, and applications from magnetocardiography and magnetomyography to magnetic-anomaly detection and space quantum technologies. 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.