French is Professor and former Head of the Photonics Group (2001–2013). His group at Imperial (with Dunsby and Neil) develops multidimensional fluorescence imaging technology for life sciences and clinical applications. Research portfolio: (1) FLIM — wide-field time-gated FLIM using gated optical intensifiers and TCSPC for single-cell FRET-based biosensing of protein-protein interactions, cell signalling (kinase activity), and drug-target engagement in multi-well plates; (2) Super-resolved microscopy — STED, easySTORM (lower-cost STORM), and SIM+FLIM for mapping molecular function to biological nanostructure below the diffraction limit; (3) FLIM endoscopy — flexible wide-field FLIM endoscopes for label-free cancer diagnostics (autofluorescence lifetime) and osteoarthritis cartilage; (4) Open-source imaging — automated multiwell plate FLIM reader for high-content drug screening. Satellite lab at Francis Crick Institute.