Heidrun Wabnitz is a senior scientist at the Department of Biomedical Optics at Physikalisch-Technische Bundesanstalt (PTB) in Berlin. She received her Dr. rer. nat. degree from Friedrich Schiller University in Jena. Her fields of work in Jena included picosecond spectroscopy of molecules and time-resolved fluorescence laser scanning microscopy. She joined PTB in 1991 where she focused on diffuse optical imaging and spectroscopy of tissues with picosecond time resolution, in particular on projects related to optical mammography and optical brain imaging. She is active in the development of time-domain instrumentation, modeling and data analysis, performance characterization of instruments, standardization, and clinical applications.