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Hermine Landt is a leading figure in the study of active galactic nuclei (AGN), specializing in reverberation mapping to probe the innermost regions of black hole accretion flows. Her work centers on using multiwavelength photometric monitoring to measure the size and temperature structure of accretion disks, directly testing the classical thin-disk model. In her landmark study of Mrk 876, Landt conducted a three-year continuum reverberation mapping campaign using remote robotic observatories, which yielded critical insights into the optical continuum-emitting region's scale and earned 19 citations. More recently, her 250-day campaign on NGC 7469 (2025, 9 citations) provided high-cadence data to measure wavelength-dependent lags, offering one of the most detailed empirical tests of the predicted τ ∝ λ^(4/3) scaling. These contributions have significantly advanced our understanding of how matter spirals into supermassive black holes, making Landt a key figure in AGN astrophysics. Her work is essential reading for students and researchers interested in black hole accretion physics and time-domain astronomy.