Hemmer pioneered NV-diamond spin sensing and super-resolution with spin defects, working on coherent control, photonic integration of NV sensors, and diamond-based magnetometry/imaging bridging physics and engineering. In the broader landscape of NV-centre ensemble quantum sensing (DEER, nano-NMR, T1 relaxometry) operating near pT/sqrt(Hz) sensitivity, this work is directly in the NV ensemble sensing lineage, emphasizing photonic integration and super-resolution readout.