Sushkov runs the US CASPEr program, using precision NMR / spin-precession (including SERF magnetometry) to search for axion-like dark matter, and develops NV-center nanoscale NMR of materials and single spins. 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.